ethiopia tax
-
Upload
villaarbaminch -
Category
Documents
-
view
225 -
download
0
Transcript of ethiopia tax
-
7/30/2019 ethiopia tax
1/60
1
THE DETERMINANTS OF CURRENT ACCOUNT
DEFICIT IN THE ETHIOPIAN ECONOMY
By: Gizaw Gezahagn
Submitted to: Daniel Abraham
ARBAMINCH UNIVERSITY
Faculty of business and economics
Department of economics
ArbaMinch, Ethiopia
March, 2012
-
7/30/2019 ethiopia tax
2/60
2
Table of contents
CHAPTER ONE PAGES
INTRODUCTION......................................................................................... 1
1.1 Background ............................................................................................................4
1.2 Statement of the problem....5
1.3 Objectives of the study........6
1.3.1 General objective. ....6
1.3.2 Specific objective .6
1.4 Hypothesis of study..7
1.5Significance of the study .8
1.6 Delimitation/ scope/ of the study.8
1.7 Limitation of study............................................................................... ...............................8
1.8 Organization of the study.8
CHAPTER TWO
LITERATURE REVIEW.......9
2.1 Theoretical Literature9
2.1.1 Current Account....9
2.1.2 Theories of International Trade10
2.1.3 Trade concepts related to Current Account .14
2.1.4 Theories/approaches/ of Current Account Determination............................................19
2.1.4.1 Elasticity approach.......19
2.1.4.2 Absorption Approach..................20
2.1.4.3 Inter temporal approach...21
2.2 Empirical Literature .........25
-
7/30/2019 ethiopia tax
3/60
3
2.2.1 Cross-Country Studies on Current Account.........25
2.2.2 Current Account Studies in Ethiopia26
CHAPTER THREE..283. RESEARCH METHODOLOGY....28
3.1 Source of data .... .28
3.2 Model specification..28
3.3 Variables Description ...29
3.4 Method of Data Analysis ......................32
Bibliography. 33
-
7/30/2019 ethiopia tax
4/60
4
CHPTER ONE
INTRODUCTION
1.1 Background of the study
Ethiopia is a country with a population about 84 million in 2010/11. It is one of the developing
country which faces the problem of low GDP growth, high inflation, current account budget
deficit and food scarcity .The high growth rate of population which is (2.4 %) per year growth
rate ,didnt much with the production of the output. (NBE, 2001)
Developing country are characterized by low level of macroeconomic performance of high total
population, low percept income or low real GDP growth, under unemployment , budget balance
deficit high rate of series in inflation, unfavorable terms of trade and market instability
(Os.sherivastiva,1996).
The high number of total population having high growth rate of the country (2.4 % in 2009,CSA),
increases the total amount of food consumptions and other thing which the country is unable to
provide it and lead to import good and service from other country rather than exporting and cause
the country current account deficit and volatile over time. The current account balance (CA) is an
important barometer for both policy maker and investor as it is an indicator of a countries
economic performance. While many countries have experienced current account deficit, large and
persistent short falls are of concern to both policy maker and investor, because it cause many
economic and financial problem to the country.
In other case, the country exports agricultural products. In open economy policy maker are
concerned with two macroeconomic goals, internal balance and external balance. Internal balance
is achieved when the economies resources are fully utilized and stability of price level is attained.
External balance is achieved when an optimal level of current account balance attained. By optimal
balance it is meant that a countrys current account is neither so deeply in deficit that the country
may be unable to repay its foreign debt in the future nor strongly in surplus that foreigners are put
in that position, (krugmman and Obstfeld, 2003). Movement of this macro economic indicator
-
7/30/2019 ethiopia tax
5/60
5
conveys information about action and expectation of all market participants in an open economy
(Bannaga, 2004).
There are several theoretical models existing in the literature that try to explain the behavior of the
current account balance. Each of them gives different prediction about the elements determining
the current account balance and the sign and magnitude of the relationship between current
account fluctuation and its determinants. Therefore understanding the determinants and empirical
analysis could help to distinguish among competing theories. A countrys international trade in
goods and service, and international borrowing and lending are recorded in its balance of payment
account. The Balance of payment consists of two main accounts. The current account and capital
account. The current account measures the change over time in the sum of three separate
components. These are Trade account, the Income account and Transfer account. On the other
hands, capital account measures the transaction into domestic currency (capital inflows) and
foreign currency (capital out flows) and the capital records purchases and sales of assets, such as
stocks, bonds, and land.
1.2Statementof the problem
The major challenge confronting most of developing country such as Ethiopian is Current
account deficit and instability from time to time which has a negative impact on macroeconomic
variable of the country. Policy-makers view the evolution of the Current Account balance as a
key indicator of the health of a nations economy.
A Current Account deficit is a reflection of the strength of a developing countrys economy such
as Ethiopia as it measures the resources coming into a country to finance investment demand in
excess of national savings. On the other hand, it can also reflect a dangerous and unsustainable
imbalance between national savings and domestic investment and the accumulation of debts that
cannot be serviced (Roubini and Watchel, 1997). The Current Account balance is also a focal
point for measuring the economic performance of an open economy for various reasons (Ibid).
In case of Ethiopia it has problems of unstable export markets and worsening terms of trade.
Ethiopia's exports are concentrated on a small number of products. In terms of value, the shares
of major export items have been fluctuating over time due to volatile behavior of price and
unpredictable demand in the international market. On the supply side, the agricultural items are
-
7/30/2019 ethiopia tax
6/60
6
influenced by policy problems, war, structural constraints, natural factors (drought, disease), etc.
there is an ever increasing.
Knowing the determinants of the Current account is one of the main things that are expected
from policy maker and every individual. The current account of Ethiopia is affected or
determined by many things from time to time. There is no sustainable increase on surplus of the
current account of Ethiopia.
This paper will dig out those determinants of current account and their insignificance value on
the term. The gap that I will full fill in the study is described as follow,
1) What are the determinants of current account balance of Ethiopia?2) What is trend investigation of current account of Ethiopia from 1980/81-2009/10
1.3 Objective of the study
1.3.1 General objective
The main objective of this study is to investigate the major determinants of current account deficit
in the Ethiopian economy.
1.3.2 Specific objective
The specific objectives of the study are:
To investigate the trend of Ethiopia current account and its component over theperiod from 1980/81-2009/10
To estimate the elasticity of the major determinants of current account deficit inEthiopia: consumption, real GDP, openness, and real effective exchange rate.
To forward a necessary suggestion towards the improvement of current accountbalance of Ethiopia
1.4 Hypothesis of study
-
7/30/2019 ethiopia tax
7/60
7
The hypothesis of this study is expected that the determinants of current account have significant
value/effects on determining current account balance of Ethiopia.
Real GDP and change in trade regime are negativelycorrelated to Ethiopian currentaccount.
Consumption is negatively related to the current account. Real exchange rate have negatively related to current account balance. Openness (Ex - Mp)are negatively related to current account balance
1.5 Significance of the study
The significance of the study is to generate new information that helps to design appropriate
polices. It is also important for other researchers used as ground who are interested to carry out
researches on this area. It is very imperative and essential as a reference for other researchers
who have desire to conduct a research on similar topic.
1.6 Delimitation (scope) of the study
This research project is focused on the typical determinant factors that affect current account
Balance of Ethiopia from 1980/81-2009/10. It would be conducted through a time series
quantitative data.
1.7 Limitationof study
The success of every study greatly depends on the availability of resources with conductive
environment. But for this paper; there will be a lot of limiting factors that the researcher faced in
conducting it
Financial constraint: to get realizable data requires more fund but the available fund doesnot allow caring out the study deeply and properly since it required more expenditure.
Lack of access of internet service because of this I forced to incur additional cost forexternal use plus there is lack of possessing important material.
-
7/30/2019 ethiopia tax
8/60
8
1.8 Organization of the study
The paper will have to be organizing in four chapters; the first chapter will have to focus on
introduction under which background and statement of the problem concerned. In addition,
objective of the study, significance and scope, and limitation of the study will be presented. Inthe second chapter I will try to discuss literature review with related theoretical and empirical
evidence. The third chapter of the study also present methodology of the study that I used both
econometrics regression and descriptive data analysis. The fourth chapter talks about the method
of data analysis and its interpretation. The last part will present the conclusion and
recommendation of the study.
-
7/30/2019 ethiopia tax
9/60
9
CHAPTER TWO
LITERATURE REVIEW
2.1 Theoretical Literature
2.1.1 Current Account
The current account records exports and imports of goods and services and unilateral transfers.
Exports of goods and services are by convention entered as positive items in the current account
and imports are entered as negative. Unilateral transfers are receipts, which the residents of a
country receive for free. Receipts from abroad are entered as positive items, while payments
abroad are entered as negative items (Sodersten and Reed, 1994). The current account can be
written equivalently as income minus absorption or as saving minus investment (Persson and
Svensson, 1985).
Since the current account is concerned with goods and services, it is generally considered to be
the most important component of balance of payments. What makes a current account surplus or
deficit important is that a surplus means that the country as a whole is earning more than it is
spending and increasing its stock of claims on the rest of the world. On the other hand, a deficit
means that the country is reducing its net claims on the rest of the world. The current account is
likely to be a cause of changes in other economic variables, such as changes in the real exchange
rate, domestic and foreign economic growth, and relative price inflation (Pilbean, 1998). Someeconomic analysts also argue that there is a strong link between large current account deficit and
financial crisis (Edwards, 2001).
The current account of the balance of payments plays several roles in policymakers' analysis of
economic developments. Since a country's balance of current account is the difference between
exports and imports, it reflects the totality of domestic residents' transactions with foreigners in
the market for current goods and services. At the same time since the current account balance
determines the evolution overtime of a country's stock of net claims on (or liabilities to) the rest
of the world, it reflects the inter-temporal decision of domestic and foreign residents; their
behavior with saving, investment, the fiscal position, and demographic factors (Knight and
Scacciavillani, 1998). Thus, it is important for policy makers to focus on the current account as
an important macroeconomic variable, to explain its movements, to assess its sustainable level,
and to seek to induce change in the current account balance through policy actions.
-
7/30/2019 ethiopia tax
10/60
10
It is worth mentioning that current account deficit is not necessarily a negative phenomenon for a
country's economic development. The country's opportunities for investing the borrowed
resources are more important than paying back loans to foreigners because a profitable
investment will generate a return high enough to cover the interest and the principal on those
loans. In this case, a deficit in current accounts is likely to be followed by future surpluses.
Similarly, a surplus in current account is not undisputedly a positive phenomenon for economic
development.
A current account deficit means that the concerned country is increasing its indebtedness or
reducing its claims on the rest of the world. If the country is a net creditor it can usually afford to
do this, whereas, if it is net debtor the deficit may be regarded as more serious problem. Another
point to bear in mind is that if a country has a large deficit due to a large government budget
deficit, then the remedy may lie in reducing government expenditure and /or raising taxes. If
however, the deficit is due to high investment then there is a good chance that future export
growth will reduce the deficit. Finally, if a country has a current account deficit, high inflation
and low economic growth, then the problem is more worrying than if the deficit is accompanied
by high economic growth and low inflation (Pilbean, 1998:54).
2.1.2 Theories of International Trade
International trade is the purchase, sale or exchange of goods and services across national
borders (Wild, Wild & Han, 2006).International tradeproduces many benefits to countries both
exporting and importing products. For countries importing products, the benefit is that they get
goods or services they cannot produce enough of on their own. Likewise, for the exporter, one of
the benefits is through the trade they can also get either the goods or services they need or the
money in which to purchase these goods from another country or source. International trade also
helps the economies of the countries by providing more jobs for people in order to process these
various commodities. The economy of countries affects the world output of international trade. If
a country's economy is slow so does the volume of international trade while a higher output
produces more trade. If a currency is weak in one country as compared to the other countries of
the world then the imports are going to be more expensive than domestic products. In relation to
http://voices.yahoo.com/topic/31609/international_trade.htmlhttp://voices.yahoo.com/topic/31609/international_trade.htmlhttp://voices.yahoo.com/topic/31609/international_trade.htmlhttp://voices.yahoo.com/topic/31609/international_trade.html -
7/30/2019 ethiopia tax
11/60
11
trade walking hand in hand with world output, trade has consistently grown faster than output.
(Ibid)
A systematic theoretical analysis of international trade could be said to have started with the
classical school of economic thought. Adam smith is dubbed as the founder of the school with
his famous book An Inquiry in to the Nature and Cause of Wealth of Nations published in
1776.
He was the first to propose a concrete theory of international trade. According to smith,
international trade occurs due to the presence of absolute cost differences in production of
various products across countries and trade is mutually beneficial to all trading partners as it
allows the maximum utilization of the benefits of specialization in production. (Mannur, 1996)
The argument for free trade based on smiths theory becomes weak if one country has absolute
advantage or disadvantage in the production of all goods.
Hence this weakness of smith is replaced by a stronger argument by David Ricardo.
Ricardo developed a principle to show that mutually beneficial trade could occur where one
nation was absolutely more efficient in the production of all goods. According to Ricardos
comparative advantage principle, comparative cost, even if a nation has an absolute cost
disadvantage in the production of both goods, a basis for mutually beneficial trade may still
exist. The less efficient nation should specialize in and export the good in which it is relatively
less inefficient and the more efficient nation should specialize in and export that good in which it
is relatively more efficient (Salvatore, 1993). The theory assumes technological differences
across countries which imply differences in factor prices across countries. As an attempt to
modify the Ricardian theory, the Heckscher - Ohlin factor endowment theory came about. The
basic model originates from the works of the two Swedish economists, Eli Heckscher (1919) and
Bertil Ohlin (1924).
According to Ricardian economics, comparative advantage was based on the differences in the
productivity of labor (as labor is the only factor of production) among nations. But according to
the H- O theory, the difference in relative factor abundance or factor endowment among nations
is the basic cause or determinant of comparative advantage and international trade. Each nation
specializes in the production of and exports the commodity intensive in its relatively abundant
and cheap factor, and imports the commodity intensive in its relatively scarce and expensive
factor. (Salvatore, 1993)
-
7/30/2019 ethiopia tax
12/60
12
In comparison to the Ricardian theory, the factor proportions theory neglects the notion of
technological differences and instead focuses on showing how factor endowments are the basis
for trade. But despite its acceptance, the H-O model performs poorly empirically. (Zinabu, 2006)
To avoid such inconvenience, Haberler reformulated the law of comparative advantage by basing
it on the opportunity cost theory rather than on the unacceptable labor theory of value. According
to the opportunity cost theory, the cost of a commodity is the amount of a second commodity that
must be given up to release enough resources to produce one additional unit of the first
commodity (Salvatore, 1993). The cost of the commodity shouldnt necessarily be inferred from
the labor content.
In this respect, there is the vent for surplus theory which assumes that when a country inters in
to international trade, it possesses a surplus productive capacity. Hence the function of trade here
is the surplus resources that would have remained unutilized in the absence of trade. This
indicates that production would be easily increased without necessarily reducing domestic
production. (Berhane, 2000)
Other theories of trade under the name contemporary theories of external trade, which are
outgrowths of the major trade theories mentioned above, have also been developed to modify
certain aspects of the conventional theory of external trade. (Iyoha, 1995)
One such theory is developed by Burenstam Linder (1961). The basic idea of the Burenstam
Linder (BL) hypothesis is that differences in preferences constitute a significant trade barrier
between countries. For him, countries with similar demand structures will trade more with one
another.
The more similar the demand structure of the two countries, the more intensive potentially is the
trade between the two countries.
Linder suggested that PCI can be used as a proxy for preferences. The hypothesis can then be
tested by comparing PCI between trading partners (Linder, 1961 as cited in Bohmann and
Nilsson, 2006). The BL hypothesis departs from the neoclassical theories of trade where supply
conditions are the most important factors for trade. BL rather argues that the structure of
preferences is the major determinant of trade flows between countries. For Linder, countries
should export the goods for which they have a large domestic market. (Ibid)
The other contemporary theory is the size and distance theory called the gravity model developed
by Linneman. He puts it that trade varies directly with size and inversely with the distance
-
7/30/2019 ethiopia tax
13/60
13
among countries. In testing the theory, Linneman tried to explain how variation in the volume of
exports is affected by size (population and national income) and distance (Elias, 1998). In
Heckscher- Ohlin theory, however, distance wasnt considered to be a barrier to trade.
Another theory, developed by Vernon (1966), is called the product cycle (Imitation,
Technological gap) theory. Vernon puts it that a country extracts comparative advantage from
goods innovated internally at least for some time when exporting these goods to the world
market. The comparative advantage exists till other imitators start to produce the same
commodity. The product cycle refers to the different phases that a given product passes through
till it finally gets imitated. The crux of the theory is the time lag between innovation and
imitation. (Elias, 1998)
The theories which are commonly known as new trade theories are developments of the 1980s.
New trade theories base international trade on economies of scale and imperfect competition.
Relaxing the following two assumptions of the H-O model leads to the new trade theories.
(Alemayehu, 1997)
I) while the H-O theory assumed constant returns to scale, international trade can also
be based on increasing returns to scale.
II) Relaxing the assumptions of perfect competition can also lead to the new trade
theory.
About half of the trade in manufactured goods among industrialized nations is based on product
differentiation and economies of scale, which arent easily reconciled with the H.O factor
endowment model. Hence to explain intra industry trade, we need new trade theories. (Ibid)
Though, it is a bit digressive, a theory relating international capital flows and international goods
trade is getting much support in recent decades. (Springer, 2000)
Overall, though most of the theoretical literature reviewed above are inclined towards the notion
of trade as an engine of growth in which export leads to economic growth; there are divergent
views on the causality. Roderick (1997) argued that lack of strong domestic economy has forced
countries to be poor participants in international trade. In agreement with this, Mannur (1996)
has labeled foreign trade in less developed countries as proverbial engine of growth. Not
taking positions, there are some who forward an intermediate view like Kravis (1970) who
considered trade not as an engine of growth but as a handmaiden to growth, but it is not by itself
a source of growth( sited by Daniel,2007).
-
7/30/2019 ethiopia tax
14/60
14
2.1.3 Trade concepts related to Current Account
I) Current Account and Budget Balance
Theoretically, there are four possibilities about the relationship between budget and trade
deficits. The first is called the Twin Deficit Hypothesis. According to this, budget deficit has
positive and significant effect on trade deficit or the main cause of trade deficit is the excessive
budget deficit (Akbostanc and Tunc, 2000). Economic reasoning for the connection between
budget deficit and current account balance may be traced from the national income identity:
Y = C + I + G + (X-M)
Here the national income (Y) equals consumption (C), investment (I), government expenditure
(G), plus the net exports (X-M). One can easily rewrite this identity by using after tax (T) income
minus consumption equals saving (S), relationship:(X-M) = (S-I) + (T-G)
In this case, net export i.e., the trade balance simply equals to the private saving investment gap
plus the budget balance. Thus, assuming a stable saving investment gap, an increase in public
sector deficit will directly increase the trade deficit, which is the traditional twin deficit
relationship.
Theoretically, the mechanism behind the twin deficit could simply be explained through the
Keynesian income-expenditure approach. An increase in budget deficit (due to government
expenditure) will increase domestic absorption and, therefore the domestic income. Increased
income will induce imports and eventually will reduce the surplus or increase the deficit in the
trade balance. An additional linkage can be explained using the Mundell-Fleming model.
Assuming high capital mobility, an increase in the budget deficit will cause an increase in the
aggregate demand and domestic real interest rates. High interest rates will cause net capital
inflow from abroad and result in appreciation of the domestic currency. This in turn will
adversely affect net exports due to higher value of domestic currency and thus there will be
deterioration in the current account. This conclusion is valid both under fixed and flexible
exchange rate regimes (Pilbean, 1998).
The Twin Deficit Hypothesis, however, has its own limitation because the analysis is based on
the assumption that private investment remains stable while government spending increases. In
reality however private investment cannot be neutral of government spending. Government
-
7/30/2019 ethiopia tax
15/60
15
spending should affect private sector expenditure at least in two ways. First, an increase in
government expenditure should induce a decrease in private sector if the government and private
expenditures are substitute or an increase in private sector if they are complements. Second, an
increase in government expenditure may induce a decrease in private sector expenditures, due to
the change in the present discounted value of tax burden.
The second possible relationship is the reverse of the first relationship i.e., trade deficit might
cause budget deficits. The third relationship states that the two deficits might also be mutually
interdependent. However, these two possibilities are not theoretically very well explained. The
fourth alternative to all these three possibilities states that there exists no relationship between
the two deficits, they are independent. Proponents of the Ricardian Equivalence Hypothesis
(REH) claim that there is no causal links between public sector deficit and external sector deficit.
According to this hypothesis, the equilibrium levels of current account, interest rates, investment
and consumption will not be affected by changes in the level of budget deficit. This can be
regarded as the extension of the Permanent Income -Life Cycle Hypothesis including
government expenditure, taxes and debt. In this framework a change in the level of budget deficit
will not change the lifetime budget constraint and real wealth of the consumer. If agents can
borrow at a constant interest rate, a reduction in tax (or an increase in expenditure) will be
regarded as an increase in the present value of future liabilities. The consumers will adjust their
savings to the change in the budget deficit and therefore, the amount of desired national savings
will not differ. In this model, it is assumed that consumers have infinite horizons. Also there are
no liquidity constraints and there is no uncertainty about the public sector behavior (Barro, 1974
pp.1096).
II) Current Account and Real Exchange RateThe effect of devaluation on the current account has been extensively addressed in traditional
open economy macroeconomics. In the Mundell-Fleming model devaluation will improve the
trade balance if the Marshall-Lerner conditions are fulfilled. This represents an intra-temporal
condition that depends up on the elasticity of demand for home and foreign goods.
Instead of having prices set in producer's currency, however, there is a possibility that some
firms in one or both countries (home country and foreign country) might set prices in the
currency of final sales. This type of pricing structure is referred to as short-run pricing-to-market
(PTM) (Devereux, 1999). The impact of devaluation on the current account can be dominated
-
7/30/2019 ethiopia tax
16/60
16
either by an intra-temporal elasticity consideration, or by inter temporal, consumption smoothing
considerations. Which effect dominates depends on critically on the extent of pricing- to -market.
With pricing -to-market, real interest rate and consumption growth can differ across countries,
due to deviations from purchasing power parity. The response of consumption to real interest
rate is determined by inter temporal elasticity of substitution. With extensive pricing-to-market,
devaluation will improve, leave unchanged, or deteriorate the current account, as the elasticity of
inter-temporal substitution is less than, equal to, or greater than unity, respectively. The impact
of devaluation on real exchange rate also depends up on the relative country size. For instance, if
the foreign country sets all its export prices in its own currency, and if the home country is very
large, then the real exchange rate is affected only slightly by devaluation.
III) Current Account and Stage of Development
The stage of development hypothesis for balance of payments suggests that as countries move
from a low to an intermediate stage of development typically import capital, therefore, run
current account deficits. Overtime, as they reach an advanced stage of development, countries
run current account surpluses in order to pay off accumulated external liabilities, and also to
export capital to less advanced countries (Chinn and Prasad, 2000). The relationship between
stage of development and current account balance is therefore expected to be non-linear. First,
development affects the current account negatively then after some time it starts to affect it
positively (Calderon et al., 1999).
IV) Current Account and Openness
There are two opposing arguments with regard to the impact of openness on current account. The
first argument suggests that the openness variable might well be indicative of attributes such as
liberalized trade that make a country attractive to foreign investment. Furthermore, international
trade often serves as an important vehicle for transfer of technology to developing countries.
Thus, countries with more exposure to international trade tend to be relatively more attractive to
foreign capital, allowing them to undertake more investment and to finance the resulting current
account deficits with capital from abroad. Also, as noted earlier, more open economics are likely
-
7/30/2019 ethiopia tax
17/60
17
to have a better ability to service their external debt through export earnings (Chinn and Prasad,
2000)
However, some analysts, especially those who are concerned with developing countries are
against this thinking. For example, Ghosh (2001) points out that both financial and trade
liberalization can play a role in building up to crises like those in East Asia, or in causing
recessions or declining in domestic manufacturing industry in several developing counties. He
indicates two important factors behind the adverse combination of payment deficits and lower
growth: terms of trade losses and rapid liberalization.
The terms of trade losses reflect the growing number of developing country exporters crowding
into already saturated markets, pushing down prices further, and reducing the income gains from
additional exports. The process of relative price decline occurred for both primary and non-
primary goods exported by developing countries. The decline in commodity prices is due to both
slow growth of aggregate demand in industrial countries as well as substitution away from the
use of such commodities because of technological change. The problem has been aggravated by
in adequate market access for developing country exports in developed markets. While
developed country markets have not become more open for developing country exports, the
markets of developing countries have been significantly liberalized. Rapid trade liberalization
drastically changed the structure of domestic demand in favor of imports, while viability of
domestic manufacturers has been eroded.
On the issue of openness, Lopez and Rodric (1989) investigated the impact of trade restrictions
on current account. Their study suggests that when non tradable are intensive in imported
intermediates, tariff acts as a supply shock in this sector. As a result, resources will be released
from non tradable to exportable and current account improves. When the input tariff leads to a
contraction of the exportable sector the net effect on current account is ambiguous.
Focusing on another instrument of trade restriction, Dyadic (1987) postulates that the effect of a
temporary import quota on current account is determined by the interaction between two
opposing forces.The inter temporal relative price effect tends to improve the current account,
while the wealth effect contributes to deterioration. Import restriction raises relative price of
present in terms of future consumption leading to a reduction in aggregate spending and
improves the current account. A temporary quota also generates a negative wealth effect. A
household attempts to spread the welfare loss over its entire planning horizon and consume in
-
7/30/2019 ethiopia tax
18/60
18
excess of its income. The corresponding increase in indebtedness contributes to current account
deterioration. With regard to flow of funds perspective, Debelle and Faruqee (1996) suggest that
countries that maintain a relatively closed capital account through barriers and controls, or
countries with limited access to foreign borrowing due to country risk, are likely to have smaller
current account imbalances than otherwise.
V) Current Account and Terms of Trade
Analyses on the effects of terms of trade on current account have come out with different
predictions. Harberger (1950) and Laursen and Metzler (1950) postulate deterioration in terms of
trade decreases real income, and the decrease in real income reduces saving out of a given
income, both measured in terms of exportable. Thus if investment is constant and there is no
government deficit, the change in saving is equal to the change in the current account surplus,
and hence the Harberger-Laursen-Metzler effect implies that current account will deteriorate in
response to a terms-oftrade deterioration (sited by Sevensson and Razin, 1983).
However, findings of theoretical analysis by Sevensson and Razin (1983) suggest that the effect
of terms of trade consist of wealth and inter-temporal substitution effects. A temporary
deterioration in terms of trade generates two effects: a temporary fall in real income and a change
in the real interest rate. The fall in real income leads to deterioration in trade balance due to
consumption smoothing behavior. The fall in real interest rate leads to a substitution effect on
spending and hence reinforces the wealth effect. Thus, the current account must unambiguously
deteriorate. Using a standard inter-temporal representative-agent model with a non durable goods
and no investment assumption, Kent (1997) predicts that a temporary positive shock to income
will lead to an improvement in the current account. Similarly, if there is no borrowing constraint,
a temporary negative shock will lead to a fall in the current account. However, the effect of
investment works in opposite direction to consumption-smoothing effect.
If there is a positive shock to terms of trade, there will be an incentive to alter the capital stock.
The change in the capital stock will be greater for more persistent shocks. The author concludes
that the longer the duration of the shock, the more likely is that investment effect dominates
consumption smoothing effect. Cashin and McDermott (1988) develop the analysis of current
account response to terms of trade shock using a three-good (importable, exportable and non-
-
7/30/2019 ethiopia tax
19/60
19
tradable) inter temporal model. According to them, adverse transitory terms of trade shock will
have three effects:
1) It will lower current national income relative to future national income (the Harberger
Laursen-Metzler consumption smoothing effect).
2) It will make current imports and current consumption more expensive relative to future
imports and future consumption, and so should induce agents to tilt their consumption to the
future, leading to a rise in current aggregate saving.
3) It will make consumption of importable more expensive than consumption of non-tradable,
causing agents to substitute in to non-tradable. This in turn raises the relative price of non-
tradable. As the higher relative price of non tradable temporarily rises, the general level of prices
rise making current consumption relatively more expensive, and inducing a rise in current
aggregate savings. On balance, the effect of terms of trade shocks on private saving and the
current account will be determined by which of these has the greater relative strength.
In a small oil importing country, changes in oil price will have significant impact in terms of
trade shocks. Marion (1982) provides the analysis of current account response to oil price
increases using an inter-temporal maximizing model. His model indicates that in the absence of a
non-traded good sector, a permanent oil price increase will improve current account because
absorption will further be reduced. Introducing a non-traded sector, however, increases in oil
price affect current account through several channels. If capital is easily substitutable for oil in
the production of the non-traded good, a future oil price increase will stimulate investment and
possibly lead to current account deterioration. However, if oil and capital goods are net
complements in the production of non-traded good sector, future oil price increase will
discourage investment leading to improved current account balance.
2.1.4 Theories/approaches/ of Current Account Determination
Several theoretical models try to explain the determinants of the current account balance.
Different model offers different predictions about the factors underlying the current account
dynamics and consequently provides different economic policy implications. In general, three
basic frameworks are commonly adopted in modeling the behavior of current account. These are
the elasticity approach, the absorption approach, and the inter-temporal approach.
-
7/30/2019 ethiopia tax
20/60
20
2.1.1. Elasticity approach
The elasticity approach treats the current account balance as the sum of trade balance and net
international investment income. It is mainly based on the analysis of price elasticity of demand
for imports and that of demand for exports, with respect to changes in exchange rate. In a typical
elasticity approach, the current account balance is mainly determined by real exchange rate,
domestic output and foreign output. This approach is largely applied to evaluate the effect of
currency depreciation or appreciation on the current account balance. In particular, it is used to
examine whether currency depreciation can help to improve the current account balance or no.
Therefore, the elasticity approach highly emphasizes the role of exchange rate and trade flows in
current account adjustments. Many economists and policymakers take this approach as granted
and use it to construct the current account models due to its general appeal and simplicity.
However, the main weakness of this approach is that it is a partial equilibrium based analysis. In
particular, it only looks at the traded goods market and ignores the interaction of other various
markets in an economy.
Originally, the current account was thought of as the net export balance of a country (i.e. the
trade elasticity approach). Consequently, relative international prices and their determinants were
viewed as central to the dynamics of the current account.
The Marshall- Lerner condition
The Marshall-Lerner condition (also called the Marshall-Lerner-Robinson, hereafter, MLR,
condition) is at the heart of elasticity approach to balance of payment. It is named after the three
economists who discovered it independently. Alfred Marshall (1842-1924), Abba Lerner (1903-
82) and Joan Robinson (1903-83). The condition seeks to answer the following question: when
does a real devaluation (in fixed exchange rates) or a real deprecation (in floating exchange
rates) of the currency improve the currentaccount balance of a country?
For simplicity, assume that trade in service, investment-income flows, and unilateral transfer are
equal to zero, so that trade account is equal to current account. In its simplest version, the MLR
condition states that a real devaluation (or a real deprecation ) of the currency will improve the
trade balance if the sum of elasticity ( in absolute value) of the demand for imports and exports
with respect to real exchange rate is greater than one (E+E 1).
-
7/30/2019 ethiopia tax
21/60
21
Note :( the real exchange rate is the relative price of foreign good in terms of domestic goods. A
real deprecation is equal to a nominal depreciation if the domestic price and foreign price levels
remain unchanged). To see this, suppose that the trade balance is expressed in units of home
currency.
At one extreme, if the demand for imports has zero elasticity, then the value of imports in home
currency will go up by the full percentage of real devaluation/deprecation. For the trade balance
to improve, the value of exports in home currency has to go up by more than full percentage of
real devaluation / deprecation. This is the case when the export elasticity is greater than one. At
other extreme, suppose the elasticity of demand for export is zero.
Then, following a real devaluation /depreciation, the value of export in home currency will
remain the same. For the trade balance to improve following a real devaluation/deprecation, the
value of imports in home currency has to go down. This is the case when the elasticity of
demand for imports is greater than one. So what the MLR condition states is that, in the event of
real devaluation, if each elasticity is less than one, but the sum is greater than one, then the
increase in imports(measured in home currency) will be more than offset by the increase in
exports( also measured in home currency ) and the trade balance will improve. The algebraic
proof of this can found in any respectable textbook on international economics (e.g. caves
Frankle and Jones, 2002)
This elementary condition rests on two assumptions. The first assumption is that we start from a
situation of balanced trade. The second assumption is that the supply elasticity is infinite. It
remains to examine each of this assumption in turn
If the initial situation is a trade deficit, then the MLR condition is a necessary, but not sufficient,
stability condition (when measured in home currency).
Indeed, consider (again) the case where the elasticity of demand for imports is zero. Thus, thevalue of imports in home currency will go up by the full percentage of real
evaluation/deprecation. But, because of the trade deficit the initial value of import was greater
than the value of exports. To improve the trade balance, the required percentage increase in
exports has to be larger than the percentage of real devaluation (in part to compensate for the
relative smaller size of exports). It should be donated when the trade balance is expressed in
-
7/30/2019 ethiopia tax
22/60
22
foreign currency, and if the initial situation is trade deficit, then the MLR condition is sufficient,
but not necessary, stability condition.
A more complex version of the MLR condition involves supply elasticitys that are less than
infinite. It can easily be shown that the smaller the sum of the supply elasticitys, the more likely
it is the MLR condition will be met (even if E+E3 less).
Marshall (1923, p.354), who was the first to formulate this stability condition could not imagine
that it would not be met. Nothing approaching to this has ever occurred in real world: it is
inconceivable, but it is imposable. He did not, supply any proof for his affirmation. Early
econometric estimates found trade elasticity has to be Lowe to satisfy the MLR condition (chang,
1951). This led to fear of elasticity pessimism (Machlup, 1950). After a careful reexamination
of statistical problems involved, these early pessimistic estimates were refuted by Orcutt (1950)
and other (sited by Gebreegziabher, 2003).
Hooper et al (2000, pp8-9) have estimated the short run and long-run price elasticitys of export
and imports for the group of seven (G7) countries.
2.1.2. Absorption Approach
The absorption approach considers the current account balance as the difference between income
and absorption, or equivalently, the difference between savings and investment. This approach is
a macroeconomics-oriented approach. It investigates the effect of exchange rate change on trade
balance through the absorption channel where income and relative prices changes by adjust. This
approach states that if an economy spends more than what it produces (i.e. absorption exceeds
income), it must import from other countries for its excess consumption and spending. This
economy thus runs a current account deficit. On the other hand, if this economy spends less than
it produces (i.e. income exceeds absorption), it runs a current account surplus. Since the sum of
current account and capital account must equal zero ex postin a flexible exchange rate regime,
shocks that occur first in capital account will obviously affect current account, vice versa.
Therefore, the absorption approach argues that it is necessary to include determinants of capital
-
7/30/2019 ethiopia tax
23/60
23
account balance when modeling the behavior of current account. This approach argues that the
exchange rate is unimportant in current account adjustments (Krugman, 1987).
This is the macro economics-oriented approach. It is based on a few simple macroeconomic
identities. Its strength is simplicity and practically. Its weakness is the lack of deep theoretical
foundation. But maybe this approach is more useful for looking at the real situation of your
country. (It can be said that the inter-temporal optimization model above is a much stronger
model than this because it is not only satisfies obvious identities but also assumes optimization).
Let starts with well known national income identity.
Y= C +I+G +X-M
(Y-income, C- private consumption, I- private investment, G- government expenditure
X- Export, M- import)
C+I+G are often called domestic demand. However, here we use more technical term
absorption or A they are the something. A= C+I+G.
The current account (CA) is X-M (here we ignore other items in CA like factor income, etc)
From above we can easily see that X-M = Y-A or simply CA= Y-A
In other word the CA is an excess of a nations production (y- income) over absorption (domestic
demand or A), Y is what the countries produces and A is what it spend for consumption and
investment and the gap is CA. Increasing Y is supply side problem. The IMF thinks that
economies liberalization (free trade, privatization, deregulation, etc) will unleash private sector
dynamisms and boost output, but this will take time, even if it is successful.
2.1.3. Inter temporal approach
Alternatively, the inter temporal approach to the current account views the current account (CA)
as the difference between domestic saving (S) and domestic investment (I): As Noted earlier, the
saving investment approach is very similar to absorption approach because it based on one
additional simply identity. It is simple, microeconomics oriented, and useful for discussing the
reality. Recall the previous national income identity on expenditure side:
Y= C+I+G+X-M
-
7/30/2019 ethiopia tax
24/60
24
To this we add the national income identity on the disposal side,( how people earn income and
allocate it to different uses). Y=C+S+T, (S- saving, T- tax). This side at income is divided
consumption, saving and taxes. (Sequentially, it may be more reasonable to say, first we pay
taxes, and then spend and saving the remainder or maybe you saves first?
CA = S Iand focused on macroeconomic factors that determine the two variables, SandI. The
Inter temporal approach recognizes that saving and investment decisions result from forward
looking calculations based on the expected values of various macroeconomic factors. It tries to
explain the current account developments through closer examination of inter temporal
consumptions, saving and investment decisions. This approach has achieved a synthesis between
the trade and financial flow perspectives by recognizing how macroeconomic factors influence
future relative prices and how relative prices affect saving and investment decisions (Obstfeld
and Rogoff, 1995). In addition to this, the basic insight of the inter temporal approach to the
current account is that the current account can act as a shock absorber that enables a country to
smooth consumption and maximize welfare in the presence of temporary shocks in a countrys
cash flow or net output. While the basic permanent income model has been very helpful in
explaining current account movements at business cycle frequencies, the consumption smoothing
perspective has generally had less to say on sustained current account imbalances and trend
developments.
Nevertheless, the model can be used to analyze longer-term variation in current account
balances, as illustrated by the relation between the current account, investment and the stage of
economic development in the permanent income model.
In particularly, inter- temporal approach suggests that the stage of economic development is an
important factor in explaining current account developments in the long-run. To be more
specific, a small open economy that is initially capital and income poor, provided it has access to
international capital markets, will run current account deficits for a sustained period of time to
build its capital stock while maintaining its long-run rate of consumption. During the adjustment,a relatively high marginal product of capital will attract capital inflows and raise external
indebtedness. Eventually, as output grows toward its long-run level and the return on capital
converges to its value abroad, the current account will improve toward (zero) balance as net
exports move sufficiently into surplus to pay the interest obligations on the accumulated external
debt.
-
7/30/2019 ethiopia tax
25/60
25
2.2 Empirical Literature Review
2.2.1 Cross -Country Studies on Current Account
In the early stage, the empirical literature concentrates more on analyzing the current accounts in
developed economies rather than in developing economies or emerging Asian economies mainly
due to the lack of data. After the 1997 Asian financial crisis, the literature has a tendency to
focus more on the behavior and determinant of current account balances in emerging Asian
economies and developing countries, especial after the emergence of global current account
imbalances. Despite the heterogeneous current account behavior in each emerging Asian
economies, most of the empirical studies have been carried out in a multi-economy framework.
This section reviews some of these studies below, which have examined on the determinants of
current account using different estimation approaches and giving different findings.
Chinn and Prasad (2003) investigate the medium-term determinants of current accounts by
adopting a structural approach that highlights the roles of the fundamental macroeconomic
determinants of saving and investment. Their basic data set has annual data for 18 industrial and
71 developing countries and covers the period 1971-1995. Both cross-section and panel
regression techniques are used in their study to examine the properties of current account
variation across countries and over time. They find that initial stocks of net foreign assets and
government budget balances have positive effects on current account balances. In addition, they
also find that measures of financial deepening are positively correlated while indicators of
openness to international trade are negatively correlated with current account balances among
developing countries.
Gruber and Kamin (2007) assess some of the explanations that have been put forward for the
global pattern of current account imbalances that has emerged in recent years, particularly the
large U.S. current account deficit, and the large surpluses of the developing Asian economies.
Their work is based on the work of Chinn and Prasad (2003), using a panel data of 61 countries
over the period 1982-2003, and including the standard current account determinants (per capita
income, relative growth rates, fiscal balance, demographic factors and international trade
openness). They find that the Asian surpluses can be well explained by a model that
incorporates, in addition to standard determinants, the impact of financial crises on current
-
7/30/2019 ethiopia tax
26/60
26
accounts. However, their model fails to explain the large U.S. current account deficit even when
the model is augmented by measures of institutional quality.
Debelle and Faruqee (1996) try to explain both short-run dynamics and long-run variations of
the current account by using a panel data of 21 industrial countries over the period 1971-1993
and an extended cross section data that includes an additional 34 industrial and developing
countries. They adopt a saving-investment perspective to motivate empirical specifications that
contain the structural determinants of current accounts. Their work finds that relative income,
government debt, and demographic factors play a significant role on the long-run variation of the
current account in the cross section, while fiscal surplus, terms of trade and capital controls do
not. In addition, by estimating partial-adjustment and error-correction models using panel data,
they find that fiscal policy has both short-run and long run impacts on the current account in the
time series. Furthermore, they find that the real exchange rate, the business cycle, and the terms
of trade also have short-run effects on the current account.
Calderon, Chong and Loayza (2002) attempt to extend the work of Debelle and Faruqee in
(1996) by applying more advanced econometric techniques to control for joint endogeneity and
by distinguishing between within-economy and cross-economy effects. They used a panel data of
44 developing countries over the period 1966-1995 to examine the empirical links between
current account deficits and a broad set of economic variables proposed in the literature. By
adopting a reduced-form approach rather than holding a particular structural model, they find
that current account deficits in developing countries are moderately persistent. Higher domestic
output growth, increase in the terms of trade and the real exchange rate appreciation tend to
worsen the current account deficit. On the other hand, increases in the public and private savings,
higher growth rates in industrial countries and higher international interest rates have favorable
impacts on the current account balance.
2.2.2 Current Account Studies in Ethiopia
In case of Ethiopia even-though there is no many researches regarding to determinant of current
account, some topics or researches that goes with microeconomic theory and policy areas are the
following:
According to Asmerom Kidane (1997) - conduct a study on the macroeconomic consequence of
Ethiopia exchange rate policy. The models/equations are estimated by ordinary least squares
-
7/30/2019 ethiopia tax
27/60
27
(OLC) by using annual covering the period between1974 and 1991. He indicated that the
exchange rate overvaluation was among the consequence of poor macroeconomic management
during 1974-1991. The overvaluation of currency discourages exports and made imports
artificially cheep. This resulted or leads to persistent current account deficit over the period. The
government was forced to balance the deficit mainly through money creation, which resulted in
double-digit inflation. Prices of non-tradable increased as much as the ratio of inflation rate.
Imposition of exchange rate control led to the emergence of parallel markets. The gap between
the parallel and official exchange rate was widening. The author also described some changes
after the October 1992 devaluation. The ratio of parallel to the official exchange rate reduced
from 3.62 before devaluation to 1.25 in September 1993. The extent of smuggling of coffee
through the borders had been reduced. On the contrary, the supply of coffee through official
market increased. There was slight improvement in the balance of payments position over 16
quarters after the devaluation. However, he admitted that the period was too short to reach in to a
consensus.
In his master thesis Mulu Woldeyes (1997) examined the effect of budget deficit on the current
account deficit during the period 1970-1995. Using Rodriguezs model he constructed the current
account function. The results of his study suggested that more than half of the changes in the
budget deficit were found to spill over to the same direction change in current account deficit. He
concluded by saying that fiscal adjustment should be taken as a prerequisite for current account
adjustment.
According to Haile kibret (2001) adopted the Monterey approach to the Balance of payment in
Ethiopia. The study investigated the role of money market in determining the Balance of
payment deficit using Johansen maximum likelihood vector error corrective modeling technique.
The empirical result suggested that money played a significant role in enplaning Balance of
payment. The writer conclude his study by suggesting that Monterey authorities have to pay
attention in controlling domestic credit creation in order to improve external balance. The
relationship between Ethiopian current account and its determinant will be analyzed in relation to
nature of economy, persistence of shocks and with respect to the impacts of the determinants on
traded and non tradable sector. The specific contribution of the study on Ethiopian current
account is that they have identified the impact of monetary and fiscal policies on Ethiopian
-
7/30/2019 ethiopia tax
28/60
28
current account balance. However they did not make comprehensive empirical investigation on
determinant of current account balance.
-
7/30/2019 ethiopia tax
29/60
29
CHAPTER THREE
3.1 Research Methodology
3.1.1 Source of data
For the study secondary source of data will be used due to availability of data. The time series
data ranging from1980/81 to 2010 will be considered on determinant factors that affect current
account deficit of the Ethiopia economy and other variables for descriptive analysis.
All the data is gathered from secondary source, and most of data are found from world bank
report and data bank, the research department of national bank of Ethiopia, Central Statistic
Agency, Ministry of Finance and Economic Development and other national and international
organizations study, different policy document, research paper, books, magazines bulletins, news
paper, survey and analyze on the current account balance of Ethiopia would be considered and
others necessarys to the issue. This data will be used to develop the model or inferential
analysis.
3.1.2 Model specification
Model specification is important part of research since if the model did not specify correctly it
lead to spurious regression.
In developing countries model it is difficult to include all the impact and determinant factors that
affect current account balance of the country because of the unavailability of all data required
and unquantifiable of determinants, consider the following variable are used as determinants of
current account balance of Ethiopia.
The model specification shows the regression of Ethiopian current account balance on set of
macroeconomic variables. First current account can be defined as follows by three forms:
1.
Income minus absorption CA=Y-A
2. Saving minus investment. CA=S-I+T-G3. Net export of good and service plus net transfer. CA=X-M+NT
Where, Yincome I-Investment M-import
-
7/30/2019 ethiopia tax
30/60
30
S-saving T- tax revenue NT- net transfer
X-export G-government expenditure A-absorption
This identity implies that factor which determine export, import, income consumption, saving
and investment also determine the current account balance of Ethiopia.
CAGT=o+ 1CONt+ 2RGDP t +3OPP t+ 4REERt + U t
Whereas: - CAGT- ratio of current account to GDP
CON-Consumption RGDP- Real gross domestic product OPP- Openness REER- Real exchange rate U t -Error termt- Period of time t=1, 2, 3.n
Relationships between economic variables are generally in exact. To allow for the inexact
relationships between economic variables, the econometrician would modify the deterministic
current account balance function by adding Ut.
Where U, known as the disturbance or error term or is a random (stochastic) variable that has
well-defined probabilistic properties. The disturbance term U may well represent all those factors
that affect or determine current account balance of the country but are not taken into account
explicitly.
3.1.3 Variables Description
A. Dependent variableCurrent account ratio to GDP (CAGT)
-
7/30/2019 ethiopia tax
31/60
31
1. CAGT is the differentiation between the total value of export and the total value of import of
goods in the country to gross domestic product. If the differentiation is positive, it is CA surplus
and it shows exportable surplus and boom of economic activity of the country whereas the
differentiation is negative, it is CA deficit and it shows exportable deficit and huge amount of
goods consumed by the resident of the country and also indicates export is not at competitive
position.
B. Independent variables
1. Consumption (CON): A variety of models predicts a negative relationship between total
consumption and current accounts over the medium term. Since when increase in consumption
net saving of individual decrease. According to inter temporal or saving and investment approach
of current account factors that decrease saving would cause negatively effect on current account
balance of the country.
2. Real Gross domestic product (RGDP). An increase in the domestic output growth rate
(RGDP) has the effect of expanding the current account deficit. As theoretical domestic
economic growth accelerates demand for foreign goods and services and consequently
deteriorates the current account balance (Abel and Bernanke, 2001). Although a rise in domestic
output growth may be associated with a greater savings rate, it seems that its correlation with the
investment rate is somewhat stronger, thus leading to a worsening of the current account balance.
So real GDP will be expected to have a negative relationship with current account balances,
which is by encouraging import and bringing about deterioration in current account.
3.Openness (OPP): The trade openness is measured as the difference of exports and imports toGDP ratio. It not only measures the degree of an economys openness to international trade, but
also reflects some of the macroeconomic policies that could be relevant for the current account
determination.In fact, the openness variable could be indicative of attributes such as liberalizedtrade, receptiveness to technology transfers, and the ability to service external debt through
export earnings (see MFR, 1996). Thus, transitional countries with greater exposure to
international trade tend to be more attractive to foreign capital. For examples such as liberalized
international trade, receptiveness of technology transfers, and ability to service external debt
through export earnings. In general, this variable measures the degree of various trade
-
7/30/2019 ethiopia tax
32/60
32
restrictions, which are likely to impede a flow of goods and services from abroad. An economy
with more trade restrictions is likely to send an adverse signal to foreign investors. On the other
hand, an economy with less trade restrictions and more exposure to international trade tends to
be relatively more attractive to foreign capital (Chinn and Prasad (2003)). Therefore, trade
openness is likely to be associated negatively with the current account balance. The common
empirical literature usually expects a negative relationship between trade openness and current
account balance. International trade in goods and services is a principal channel of economic
integration, which has an impact on the determination of current account. Gruber and Kamin
(2005) mentioned that more open economies are likely to have larger tradable goods sectors and
thus be able to adjust their external balances more flexibly. In addition to this, economies that are
more open to international trade they have more capacity to generate foreign exchange earnings.
However, the expected sign of the openness ratio is ambiguous. Gruber and Kamin (2005) find
that larger current account balances are associated with greater degrees of economic openness.
4. Real effective exchange rate (REER): The REER can affect the current account balance in
various ways. First, based on the elasticity approach, the Mundell-Fleming model suggests that
an increase in the REER can have a negative effect on an economys international trade
competitiveness. It is quite likely to lower exports and increase imports, leading to a worsening
current account balance. However, the overall effect on the trade balance depends on the relative
size of the import and export volume elasticity assuming full pass-through of the exchange rate
to relative prices. The absorption approach also suggests that a home currency appreciation can
lead to a switch in spending from domestic to foreign goods through its impact on the terms of
trade and domestic production, and thus deteriorates the current account balance. Second, the
Balassa-Samuelson effect states that an appreciation in home currency reflects productivity gains
in the domestic manufacturing as well as the demand side influences, for examples, the use of
capital inflows and high government spending to build up infrastructure. Moreover, after a home
currency appreciation, the purchasing power of current and future income increases, as does that
of monetary and property assets already accumulated. This positive wealth effect has a negative
impact on the propensity to save. Therefore, an increase in the REER is negatively associated
with it. In this study, an increase (decrease) in the REER series denotes a real appreciation
(depreciation) in the home currency the propensity to save, and consequently with the current
account balance. Third, the consumption-smoothing hypothesis suggests that the current account
-
7/30/2019 ethiopia tax
33/60
33
acts as a buffer to smooth consumption in the face of shocks to national cash flow (i.e. output
less investment). In response to an increase in the REER, an open economy would prefer to run a
current account surplus and invest abroad rather than allow consumption to increase. As a result,
a home currency appreciation can result in an improvement of the current account (Herrmann
and Jochem, 2005). Finally, an increase in the REER can also have a negative balance sheet
effect on an economys NFA and affect remittance flows (Faini, 1994). After all, the link
between the REER and the current account balance can only be determined empirically.
3.1.4 Method of Data Analysis
In this study, two method of data analysis is used to explain the relationship between the
dependent and independent variable. To do this descriptive data analysis will be used that is
useful to look the variation of dependent variable to be explained and compare it with the
characteristics of variation in explanatory variable. Hence conducting descriptive analysis is used
before under taking regression analysis help us to learn much about the relationship between
dependent and independent variable.
I used econometrics analysis or economic data in order to lend empirical support to the economic
model and obtain numerical result and quantitative analysis.
Since the important part of econometric model is empirical model. In addition to descriptive
analysis, in order to capture the degree of influence of some of the determinants of current
account balance, econometric analysis would be applied. The time series data to run the
regression covers the year between 1980 and 2010 in using a time series data but there is a
possibility of getting a dubious (suspicious, full of doubts) result because of non-stationary of the
data. This kind of regression is called spurious regression due to this kind of problem a stationary
test(it is a test of whether the data has constant mean, variance, covariance with time variation.
since the need for stationary test arises because estimating regression using non-stationary
variables based on ordinary least squares (OLS) leads to spurious and inconsistent results
(gujirat,1995).In addition, if variables are non-stationary, it is difficult to conduct hypotheses
testing because classical assumption on the property of error term, which zero mean constant
variance and non-auto correlated, will be violated (harris,1995).Therefore, stationary test is very
essential.) will be applied in this study. The estimation of model will be made using ordinary
-
7/30/2019 ethiopia tax
34/60
34
least square method (OLS) with different tests. If the model is not correctly specified we
encounter the problem of model specification error or model specification bias(exclusion of
variables or unobserved heterogeneity, incorrect mathematical form(if we wrongly apply
quadratic form while it not),neglecting dependent variable lags, generally, leads to model
important specification bias and those are cause for auto-correlated, heteroskedasticity. The
model may have omitted important variables or have used the wrong functional form(Wrong
functional form:Even if we have theoretically correct variables explaining a phenomenon and
even if we can obtain data on these variables, very often we do not know the form of the
functional relationship between the regressand and the regressors. Is consumption expenditure a
linear (invariable) function of income or a nonlinear (invariable) function? If it is the former, Yi
= 1 + B2Xi + uiis the proper functional relationship between YandX,but if it is the latter, Yi =
1 + 2Xi + 3Xi2+ ui may be the correct functional form. In two-variable models the functional
form of the relationship can often be judged from the scatter gram. But in a multiple regression
model, it is not easy to determine the appropriate functional form, for graphically we cannot
visualize scatter grams in multiple dimensions. To aid us in determining whether model
inadequate is on account of one or more problem we can use some of the following test (test of
Stationary, Co-integration test, Error Correction Method (ECM) test, Specification error test,
Test for heteroskedasticity ,Test for Multicollinearity, Test for autocorrelation). Test is useful in
econometric analysis, since the data may face some error, which leads to wrong decision making.
3.2 Estimation procedures and Results
3.2.1 Stationary and Non-stationary series
In Economic research involving time series data before any kind of statistical estimation takes
place, the data of all variable in the model have to be tested for their stationary. This is mainly
because the model may contain non-station any variable that would lead to problem o f spurious
regression.
Theoretically time series is a collection of random variables such collection of random variables
ordered in time is called a stochastic process. A stochastic is said to be stationary if it is mean(x)
and variance (var(x)) are constant over time and value depends on the distance or lag between
-
7/30/2019 ethiopia tax
35/60
35
two time periods and not on the actual time at which the covariance (cov(x)) is computed.
(Gujarat, 1992)
If the time series is not stationary has both economic and statistical implication. The statistical
implication is that the variable will not have constant mean, variance and covariance if they are
plotted against time (Gujarat, 1995).
A given series is said to be stationary if its mean and variance are constant over time and the
value of the covariance between any two time periods depends only on the distance or gap or lag
between the two time periods and not the actual time at which the covariance is computed.
Generally the concept of stationary can be summarized by the following conditions. A time
series {yt} is said to be stationary if:
Constant mean( E[yt]=E[yt-s]=) Constant variance(E[yt- ]2=E[yt-s- ]2=y2 and Auto covariance(E[yt-][yt-s-]=E[Yt-j-][yt-j-s-] = (s)Where ,y
2,(s) are all constant (free from t)
Stationary may be weak or strong stationary (i.e. the whole distribution of the variable does notdepend on time). Time series to be weak stationary if, E (Yt) is constant and independent of time,
var (yt) is infinite, positive constant and independent of time and cov(yt, yk) is a finite function of
t-k but not of t or k.
The assumption of stationary is somewhat unrealistic for most macroeconomics variables. The
non stationary process arises when at least one of the conditions for stationary does not hold.
Let us consider an autoregressive of order 1, AR (1) process:
yt=yt-1+t [1]
Where, t denotes a serially uncorrelated white noise error term with a mean of zero and a
constant variance.
Equation [1] can be expressed as follows
-
7/30/2019 ethiopia tax
36/60
36
Yt=TYt-(T+1) + t +t-1 +
2t-2 +3t-3 +4t-4++t-T [2]
Non-stationary can originate from various sources but the most important one is the presence of
so-called unit roots, which means when = 1 in equation [1] or remain equal to one as T
goes to infinity in equation [2]. Equation [1] and [2] becomes random walk without drift model.
If a variable is stationary in level, i.e. without running any differencing, then the variable is said
to be integrated of order zero, denoted by I(0). Similarly, if it becomes stationary by differencing
once, then the variable is side to be integrated of order 1, written as I (1). Unit-root test helps to
detect whether a variable is stationary or not. It also provides the order of integration at which
the variable can be stationary.
A spurious regression occurs when the regression results are detected and there is a positive and
significant relation between variables, but the variables do not have a meaningful and cause-
effect relationship. It results when one regress a non-stationary variable on another.
To avoid such spurious trend and conduct a meaningful econometric regression, we have to
avoid the unit roots. The most widely used method to avoid the problem of unit roots is
transformation of the variables by way of differencing to remove the non- stationary (stochastic -
trend).
The other usual method to take care of spurious regressions is to use the technique of co
integration (making the difference stationary rather than the individual variables).In any time -
series; however, we test for the presence of unit roots before proceeding to undertake other
analysis.
3.2.2 Tests for unit roots (not stationary)
A test of stationary (or non-stationary) that has become widely popular over the past several
years is the unit root test. For a number of reasons, it is important to know whether or not an
economic time series has a unit root. A Nelson and Plosser (1982) pointed out; non stationary
often has important economic implications. It is therefore very important to be able to detect the
presence of unit roots in time series, normally by the use of what are called unit root tests. For
these tests, the null hypothesis is that the time series has a unit root and the alternative is that it is
I (0).The widely used unit-root tests are Augmented Dickey Fuller test (ADF).
I) Dickey Fuller (DF) test
-
7/30/2019 ethiopia tax
37/60
37
The simplest form of the DF (Dickey fuller, 1979) test amounts to estimating
Yt =yt-1 + ut [3]
One could use a t- test to test the hypothesis =1 against < 1. Alternatively, one can rearrange
the model as follows:
Yt-yt-1=yt = ( -1) yt + ut
Or, in short,
yt= yt + ut [4]
Where ut is IID (0, 2) with =-1
The test hypotheses are H0: =0 against H1: >0.However, using regression equation like
equation [4] is valid when the overall mean of the series is zero.
When the underline data generating process is not known, it is better to allow a constant or/ and a
time trend and then to test for a unit root. In that case, the model needed to be tested for the null
hypothesis of stochastic trend (non stationary) against the alternative of stationary up to
deterministic trend. In practice, the model may involve a constant or a trend. Dickey and Fuller
(1979) actually considered the three models
1. yt =yt-1+ut2. yt =+yt-1+ut and3. yt =+ ct+yt-1+ut
For each model, one will need to use different critical values. The reason is that, under nonstationary the t-like statistic computed does not follow a standard t-distribution, but rather a DF
distribution.
II) Augmented Dickey Fuller (ADF) test
-
7/30/2019 ethiopia tax
38/60
38
The ADF test is comparable with the simple DF test, but it is augmented by adding lagged values
of the first difference of the dependent variable as additional regressors which are required to
account for possible occurrence of autocorrelation. Consider the AR (p) model:
Yt = +1yt-1+ p yt-p + t [5]
We can write equation [5] as:
Yt = +1yt-1 + yt-1 + t
=-(1- ) and i =
The test statistics is t DF =
where hat is OLS estimate of = ( -1), tDF has to be
compared against the 95% critical value of the appropriate DF distribution,which depends on the
inclusion of the linear trend and the lag structure. Then we use the t-statistic on the coefficients
to test whether we need to difference the data to make it stationary or we need to put a time trend
in the regression model to correct for the variables deterministic trend. The null hypothesis for
the test is given as H0: = 0, there exists a unit root problem.
The econometrics model will be valid if and only if the variables in the model passed stationarytest because this test shows a long-term relationship between dependent and independent
variables of the model.
3.2.3 Co-integration
Estimation of non-stationary time series data and analysis of short run dynamics is often done by
first eliminating the trend in the variables, usually through the process of differencing till
stationary is achieved.
This procedure, however, throws away potential valuable information about long run
relationships which economic theories have a lot to say about (Maddala,1992).These problems of
loosing long run information can easily be amended if it is possible to find a co integration
vector through a co-integration analysis.
-
7/30/2019 ethiopia tax
39/60
39
The concept of co-integration mimics the existence of long run equilibrium to which an
economic system converges over time, whereas the absence of co-integration leads to the
problem of spurious regression (Harris, 1995: Harris and Sollis, 2003). Two broad approaches
for co-integration have been developed. These are Engle and Granger (1987) method and the
Johansen approach, due to Johansen (1998), based on vector autoregressive model (VAR)
(Green, 2003).
On the other hand, the usual approach used to handle unit root problem (non stationary at level)
is to difference all non- stationary variables used in the regression. But, while the use of
differenced variables avoids the spurious regression problem, it will also remove any long run
information that may be of interest (Paulos, 1999). Our interest here is to investigate whether the
explanatory variables (Consumption, Real GDP, Real Effective Exchange Rate (REER), and
Openness) have a significant role in determining the long run path of Current Account Deficit.
Thus, if the variables co integrates at levels, we will proceed to estimation of the model.
Co- integration is defined as a situation where two or more series are linked to form an
equilibrium relationship across time. In plain terms, even if the individual time series data are
non- stationary, their linear combination could be stationary and they will move closely together
over time to make their differences stable (stationary). This is to say, the linear combination
cancels out the stochastic trends in the two series (Gujarati, 2003); and a common stochastic
trend should be shared among them in the long run. That is, they should not drift apart from each
other as time goes on.
3.2.4 Co-integration TestsTwo variables will be co-integrated if they have a long-term, or equilibrium relationship between
them. A test for co-integration can be thought as a pre-test to avoid spurious regression situation.
There are the two test that most used to test co-integration which are the Engle - Granger, and
Johnsons test. But in this study, I use the case of Engle - Granger (EG) test.
In the Engle-Granger two-step procedure, there are two steps to attend to if Yt = I (1) and
Xt = I (1):
Step 1: The residual from a long run model OLS regression is tested for unit roots based on
ADF statistics.
-
7/30/2019 ethiopia tax
40/60
40
Step 2: Order of integration is tested whether the error term t = I (0) against its alternative t
= I (1) from the first OLS regression.
The EG twostep procedure is easy to implement but is constrained in some ways. The method
assumes only one (single) co-integrating vector and is thus unable to trace more than one co -
integrating relationship. Moreover, it presumes that the explanatory variables are weakly
exogenous (determined outside the model) while the dependent variable is endogenous. But in
many instances, there exists endogenous character among variables and, inferences made based
on such pre-supposition may sometimes be misleading.(Mohammed, 2005).
As Enders (1995) puts it, perhaps the major limitation is that, the estimation of the long run
equilibrium regression using EG requires that the researcher places one variable on the left and
use others as regressors.
Johansens procedure has improved up on these pitfalls but since the model to be estimated in
this study fulfils the requirements of the EG methodology, we wont use the alternative approach
though it has the benefit of a single step procedure that is absent in EG procedure.
3.2.5 E