Monetary Policy, Bank Management and Industrial Sector Finance in ...
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Monetary Policy, Bank Management and Real Sector Finance in
Nigeria: Who is to Blame?
Adolphus J. Toby,
Department of Banking and Finance,
Rivers State University of Science and Technology, Nigeria.
Email: [email protected]
Deborah Peterside,
Department of Banking and Finance,
Rivers State University of Science and Technology, Nigeria.
Email: [email protected]
___________________________________________________________________________________
Abstract
This study entails a critical analysis of the effects of monetary policy and selected bank
management decisions on commercial bank lending to agriculture and manufacturing in
Nigeria for the period 1980-2010. Relevant data generated from the Central Bank of Nigeria
(CBN) annual reports were analysed with the Software Package for Social Sciences (SPSS).
Four multiple regression models were specified, with the independent variables (IVs) tested
for multicollinearity employing the Variance Inflation Factors (VIFs) and tolerance values.
The descriptive results show that within the period, average bank liquidity ratio (BLR) was
46.4%, well above the prescribed average minimum of 27.7%. The average cash reserve
ratio (CRR) was 6.0%, in a period widely portrayed to support easy monetary policy regimes.
The average loan-to-deposit ratio (LTDR) was 69.5%, far below the prescribed prudential
maximum of 80.0%. While the incidence of funding risk exceeded the liquidity risk banks were
exposed to, the average margin reaped by banks was an average of 11.9%. Within the period,
the average sectoral allocations of commercial banks’ credit to the agricultural and
manufacturing sectors were 10.1% and 28.4% respectively. The inferential results show that
bank management decisions were significantly insensitive to the credit needs of the
agricultural and manufacturing sectors. The shoring up of banks’ core deposits through
increased deposit mobilisation was more significant in driving increased sectoral allocation
of credit to the agricultural and manufacturing sectors. The explanatory powers of bank
rates in determining the sectoral allocation of commercial banks’ credit to these two critical
sectors are more pronounced than the selected bank management ratios. For a period of 21
years (1980-2010), the regulatory authorities failed in adopting the relevant monetary policy
regimes to direct credit naturally, without coercion, to the agricultural and manufacturing
sectors in Nigeria. The seeming regulatory favouritism occasioned by the abolition of the
mandatory sectoral allocation of bank credit, easy monetary policy stance and prudential
paternalism gave the banks an ample opportunity to build their liquidity profiles at the
expense of funding the real sector. Rather, the banks reaped wide margins through rent-
seeking and the maximisation of shareholders’ wealth.
_________________________________________________________________________
Keywords: monetary policy, bank management, real sector, sectoral allocation of credit
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1. Introduction
Monetary policy is the deliberate use of monetary instruments (direct and indirect) at the
disposal of monetary authorities such as the central bank in order to achieve macroeconomic
stability (Ezema, 2009). A monetary policy shift tends, generally, to transmit a change for the
future in the expected behaviour of macroeconomic variables. In a developing or emerging
economy, monetary policy shift is often designed in response or reaction to undesirable
shocks in the monetary system and macroeconomy in order to restore equilibrium and achieve
a set of objectives. Ubi et al (2012) have suggested that monetary policy should be consistent
and transparently defined in response to the dynamics of the domestic and global economic
development.
The Central Bank of Nigeria’s monetary policy shifted from quantitative easing in
September 2010 to monetary tightening in 2011, in response to the apparent threats of
inflationary build-up. Tight monetary policy aimed at moderating the anticipated inflationary
pressures, expected to be triggered by the pre-election spending and the high liquidity
injections into the banking system through the purchase of non-performing loans (NPLs) by
the Asset Management Corporation of Nigeria (AMCON).
In the context of this study, bank management refers to the various decisions taken by
deposit money banks (DMBs) in order to influence the liquidity, funding and capital
adequacy of banks, and maximise shareholders’ wealth, subject to monetary policy
constraints. It also includes the extent of compliance with regulatory standards by DMBs. It
is hypothesised that these liquidity and funding decisions, constrained by the cash reserve
ratio and the monetary policy rate, could affect the sector’s contribution to the gross domestic
product (GDP). The earlier works of Toby (2011) have suggested that rural bank management
expanded aggregate credit in such a manner that constrained their liquidity profiles, and
created a critical gap in bank intermediation in the rural and SME sectors.
Sanusi (2011) has argued that economic development is about enhancing the productive
capacity of an economy by using available resources to reduce risks, remove impediments,
which otherwise could lower costs and hinder investments. Tawose (2012) suggests that the
contribution of the industrial sector to the GDP is significantly explained by commercial
banks’ loans and advances to the industrial sector, interest rate and inflation rate. Okoye and
Eze (2013) have found that the monetary policy rate has a critical and significant impact on
the bank lending rate in Nigeria.
Enyioko (2012) has found that the interest rate policies in Nigeria have not improved the
overall performance of banks significantly and have contributed marginally to the growth of
the economy. Nwosa and Saibu (2012) have demonstrated the interest rate channel was most
effective in transmitting monetary policy to sectoral output growth in the agriculture and
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manufacturing sectors in Nigeria between 1986 and 2009. The works of Udoh and Ogbungu
(2012) have shown that the inefficiency of the financial sector is responsible for the adverse
impact on industrial production. Sangosanya (2011) has employed the estimated dynamic
panel model to show that manufacturing firms finance mix, utilization of assets to generate
more sales, abundance of funds reserve and government policies are significant determinants
of manufacturing firms’ growth and thus dictated their dynamics in Nigeria.
Edoumiekumo, et al, (2013) have examined the responsiveness of real sector output to
monetary policy shocks in Nigeria. Applying a VAR model and covering the period 1970 to
2011, the study revealed that credit to the private sector (CPS) had a direct, instantaneous
impact on real sector development (GDP). Real GDP responded more to shocks in monetary
policy rate (MPR) and credit to private sector (CPS) in the long run. The study concludes that
monetary policy in Nigeria encouraged credit to the private sector and capital accumulation.
The works of Imoughele and Ismaila (2014) have found that interest rate, exchange rate
and external reserves impacted negatively on the manufacturing sector in Nigeria between
1996-2012. Financial analysts have equally argued that high interest rate is stifling the
growth of the real sector in Nigeria (Nnodim, 2014). Usman and Adegare (2014) study the
impact of monetary policy on industrial growth in Nigeria for the period 1970-2010. The
study found that the rediscount rate and deposit size have a significantly positive effect on
industrial output, but investment in treasury bills (TBs) has a negative impact on industrial
growth. Odior (2013) investigates the impact of macroeconomic factors on manufacturing
productivity in Nigeria over the 1975-2011 period. The findings show that credit to the
manufacturing sector in the form of loans and advances and foreign direct investment have
the capacity to sharply increase the level of manufacturing productivity in Nigeria, while
broad money stock has less impact.
Recently, banks are struggling to grapple with a 2014 tight monetary policy regime which
pegs the cash reserve ratio (CRR) and monetary policy rate (MPR) at 12 per cent, and a
special CRR on public sector deposits at 75 per cent. Consequently, their constrained balance
sheets are likely to hinder the flow of credit to the industrial sector, with emphasis on
agriculture and manufacturing. Toby and Peterside (2014) have shown empirically that the
role of the Nigerian deposit money banks in facilitating the contribution of the agriculture and
manufacturing sectors to economic growth is still significantly limited. The study argues that
the growing risk aversion of Nigerian banks towards these sectors is the primary reason for
the liquidity and funding shortages in the critical sectors of the economy. The research
analyses the sectoral allocation of bank credit to these sectors between 1980-2010, some of
the years being influenced by the era of mandatory sectoral allocation of bank credit.
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What is not yet known is the critical role of monetary policy and bank management in the
financial intermediation puzzle, with respect to the real sector of the Nigerian economy. The
major research questions are (1) what is the nature of the relationship between interest rate
(proxy of monetary policy) and industrial growth in Nigeria? (2) What is the nature of the
relationship between bank management and industrial growth in Nigeria. The study null
hypotheses are:
H01: There is no significant relationship between bank interest rates and commercial bank
lending to the agricultural sector.
H02: There is no significant relationship between bank interest rates and commercial bank
lending to the manufacturing sector.
H03: There is no significant relationship between selected bank management variables and
commercial bank lending to the agricultural sector.
H04: There is no significant relationship between selected bank management variables and
commercial bank lending to the manufacturing sector.
The next part of the paper discusses the background of the study, then the methodology
and model specifications, results and discussion. The paper concludes with financial policy
implications of the study.
1.1 Background of the Study
The Central Bank of Nigeria Annual Report (2010) provided the framework for
understanding the direction of this study. The monetary and credit developments in the 2006-
2010 period, the maturity structure of DMBs loans and advances portfolio, and the proportion
of bank credit to preferred and less preferred sectors are summarised in the report.
Monetary growth was sluggish in 2010, despite the monetary easing policy maintained by
the Central Bank of Nigeria. The stance of monetary policy was to inject liquidity into the
economy and restore confidence in the Nigerian Financial System. The measures taken
included the continuation of guarantees on inter-bank transactions and towards the end of the
year, the purchase of non-performing loans (npls) from the DMBs by the Asset Management
Corporation of Nigeria (AMCON).
The growth of the key monetary aggregate at the end of December, 2010 was below the
indicative benchmark and the growth rate attained at the end of the preceding year (Table 1).
Broad money (M2) grew by 6.7 per cent, compared with 17.5 per cent at the end of December,
2009, and the indicative benchmark of 29.3 per cent for fiscal 2010. The rather slow growth
in money stock was driven by the increase in domestic credit (net) and other assets (net) of
the banking system. Narrow money (M1) grew by 10.6 per cent at the end of December,
2010, compared with the growth of 3.0 per cent at the end of preceding year. Aggregate bank
credit to the domestic economy (net) grew by 13.4 per cent, compared with the growth of 59.6
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per cent at the end of December, 2009. The development was attributed, largely to the 64.2
per cent growth in net credit to the Federal Government. Claims on the private sector,
however, declined by 4.1 per cent, in contrast to the growth of 26.6 per cent recorded at the
end of December 2009. Base money, the CBN’s operating target for monetary policy, which
stood at N1,803.9 billion, grew by 9.1 per cent but was lower than the indicative benchmark
for the year by 25.9 percentage points.
Table 1: Key Policy Targets and Outcomes, 2006-2010 (per cent)
Monetary Policy Indicators 2006
Target Outcome 2007
Target Outcome 2008
Target Outcome 2009
1/
Target Outcome 2010
2/
Target Outcome
Growth in base money
7.5
27.8
3.3
22.6
20.8
58.9
3.6
6.7
35.0
9.1
Growth in broad money (M2) 27.0 43.1 24.1 44.2 45.0 57.8 20.8 17.5 29.3 6.7
Growth in narrow money (M1) n.a. 32.2 - 36.6 - 55.9 32.2 3.0 22.4 10.6
Growth in aggregate bank
credit
-72.3 -69.1 -29.9 276.4 66.0 84.2 87.0 59.6 51.4 13.4
Growth in bank credit to
private sector
30.0 32.1 30.0 90.8 54.7 59.4 45,0 26.6 31.5 -4.1
Inflation rate 9.0 8.5 9.0 6.6 9.0 15.1 9.0 13.9 11.2 11.8
Growth in real GDP 7.0 6.0 10.0 6.5 7.5 6.0 5.0 7.0 6.1 7.9
1/ Revised
2/ Provisioned
Source: Central Bank of Nigeria Annual Report, 2010.
1.2 Liquidity Management
Monetary policy in 2010, as in the preceding year, was conducted against the background
of managing the devastating effects of a liquidity crunch in the domestic economy, arising
from the global financial and economic crises of 2007/2008 and internal problems in some
deposit money banks in Nigeria. Liquidity management was, therefore, geared towards
improving the liquidity and efficiency of the financial markets, without compromising the
primary objective of monetary and price stability. The CBN made use of open market
operations (OMO), complemented by macro prudential cash and liquidity ratios, standing
facilities, tenured repurchased transactions, sale of treasury instruments at the primary
segment of the market, and foreign exchange market intervention.
The monetary easing policy that commenced in the late 2009, which was aimed at
improving banking system liquidity, ensuring financial system liquidity, and a steady flow of
credit to the real sector of the economy continued in 2010. The monetary policy measures
implemented in 2010 substantially improved the liquidity conditions in the banking system,
thereby ameliorating to a large extent, the challenge of the credit crunch in the banking
system. The sustenance of banking reforms, unrestricted access to the discount window, and
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the guarantee of inter-bank transactions increased the level of confidence in the banking
system.
Analysis of the structure of DMBs’ outstanding credit at the end of December 2010
indicated that short-term maturity remained dominant in the credit market (Table 2).
However, there was an improvement in the share of long-term maturity. Outstanding loans
and advances, maturing one year and below accounted for 65.3 per cent of the total, compared
with 70.3 per cent at the end of December, 2009, while the medium-term (between 1-3 years)
and long-term (3-year and above) accounted for 14.6 and 20.1 per cent respectively,
compared with 14.3 and 15.3 per cent at the end of December, 2009.
Table 2: Maturity Structure of DMBs Loans and Advances and Deposit Liabilities (per cent)
Loans and Advances Deposits
Tenor/Period 2006 2007 2008 2009 2010 2006 2007 2008 2009 2010
0-30 days 54.4 49.2 46.6 50.1 46.1 66.6 74.1 72.7 73.3 76.3
31-90 days 11.0 11.3 13.4 6.4 10.0 16.6 12.3 13.1 15.0 14.4
0-181 days 6.3 5.8 7.8 7.3 3.9 3.5 4.3 6.2 4.7 3.4
181-365 days 6.4 9.5 7.5 6.5 5.3 1.4 2.6 2.7 2.7 2.8
Short-term 78.02 75.83 75.4 70.3 65.3 88.1 93.3 94.8 95.7 96.87
Medium-term
(above 1 year and
below 3 years)
8.3 13.5 14.5 14.3 16.6 5.4 3.3 5.2 4.1 2.06
Long-term
(3 years and above)
13.7 10.7 10.1 15.3 20.1 6.5 3.3 0.03 0.069 1.005
Total 100 100 100 100 100 100 100 100 100 100
Source: Central Bank of Nigeria Annual Report, 2010
Analysis of DMBs’ deposit liabilities shared a similar trend, with short-term deposits of
below one year maturity constituting 96.9 per cent of the total. The share of deposits of less
than 30-day maturity was 76.3 per cent, while long-term deposits of more than three (3) years
had a share of 1.0 per cent at the end of December, 2010, compared with 0.1 per cent at the
end of December, 2010, compared with 0.1 per cent at the end of December, 2009. The
structure of DMBs’ deposit liabilities explains banks’ preference for short-term claims on the
economy.
Table 3 shows that as at the end of December, 2010, credit to the core private sector by
the DMBs declined by 4.8 per cent, in contrast with the growth of 25.1 per cent at the end of
December, 2009. Of the amount outstanding, DMBs’ credit to priority sectors constituted
30.4 per cent, of which agriculture, solid minerals, exports and manufacturing received 1.7,
15.3, 0.6 and 12.8 per cent respectively. The less priority sectors accounted for 47.8 per cent
of outstanding credit, compared with 46.9 per cent at the end of December, 2009, while
unclassified sectors accounted for the balance of 21.8 per cent.
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Table 3: Bank Credit to the Core Private Sector, 2006-2010
Share in Outstanding (Per cent)
Sector 2006 2007 2008 2009 2010
1. Priority Sectors 30.3 25.9 26.2 25.2 30.4
Agriculture 2.2 3.2 1.4 1.4 1.7
Solid minerals 10.1 10.7 11.3 12.7 15.3
Exports 1.2 1.4 1.0 0.5 0.6
Manufacturing 16.9 10.4 12.5 10.6 12.8
2. Less Preferred Sectors 46.0 41.2 42.0 46.9 47.8
Real Estate 5.9 6.2 6.2 8.3 8.7
Public Utilities 0.9 0.6 0.6 0.8 0.7
Transport and Comm. 7.6 6.8 7.2 8.3 10.7
Finance and Insurance 4.6 9.4 9.5 13.1 11.3
Government 4.5 3.7 1.9 3.7 4.9
Imports and Domestic
Trade
22.5 14.5 16.4 12.8 11.7
3. Unclassified 23.7 32.0 31.8 27.9 21.8
Total (1 + 2 + 3) 100 100 100 100 100
Source: Central Bank of Nigeria Annual Report, 2010.
2. Literature Review
From a macroeconomic perspective, the nature of banking activities and banks’ position
as intermediaries makes these institutions relevant for the transmission of monetary policy.
Two important channels of monetary policy transmission depend on the functioning of the
banking sector: the traditional interest rate channel and the credit channel. The interest rate
channel operates when the central bank’s adjustments to the nominal interest rate have an
impact on the real interest rate (assuming a degree of price stickiness) and thus on the pattern
of investment and consumption. This channel will only work, however, if banks transmit the
changes in the monetary policy rate to their customers. The credit channel, in turn, assumes
some capital market imperfections, such as asymmetric information, that induce a contraction
of the quantity of credit when the central bank imposes a restrictive monetary policy.
It is shown in Peersman and Smets (2002) that on average the negative effect of an
interest rate tightening on output is significantly greater in recessions than in booms. Francis
et al (2011) find that the relevance of the interest rate and credit channel appears to be more
robust to business cycle uncertainty. Peersman (2013) demonstrates that within-year
differences in the responses of output and prices following monetary policy shocks are not
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more pronounced in the service sector, where labour costs represent a larger fraction of the
total production costs.
A resurgence of interest in the role of banks in the transmission of monetary policy has
resulted in a spate of theoretical and empirical studies. A number of studies have offered an
explanation on the manner in which monetary policy actions affect investment, prominent
among them are the classical school (Mayumster, 2007), the Keynesian view (Barro, 1997),
and the credit channel approach (Kahn, 2010; Bernaike and Gertler, 1995). The recent works
of Huang et al (2014) show that bank concentration magnifies industrial growth volatility, but
reduces the volatility in sectors with higher external liquidity needs.
Arnold et al (2006) have presented evidence on the industry effects of bank lending in
Germany and identifies the industry effects of bank lending associated with changes in
monetary policy and industry-specific bank credit demand. The study estimates individual
bank lending functions for 13 manufacturing and non-manufacturing industries and five
banking groups using quarterly bank balance sheet and bank lending data for the period
1992:1-2002:4. The research concludes that the industry composition of bank credit
portfolios is an important determinant of bank lending growth and monetary policy
effectiveness.
The works of Granley and Salmon (1997) have demonstrated, using UK data, that the
effects of an unanticipated monetary policy tightening seem to be unevenly distributed across
sectors of the economy. Manufacturing as a whole responds quite sharply to a monetary
tightening, but some large industrial sector enterprises, notably the utilities, show a subdued
reaction.
Tobins and Mambo (2012) explore the relationship between monetary policy and private
sector investment in Kenya by tracing the effects of monetary policy through the transmission
mechanism to explain how investors responded to changes in monetary policy. Based on the
empirical results, the study suggests that tightening of monetary policy by -1 per cent has the
effect of reducing investment by -2.63 per cent while the opposite loose monetary policy
tends to increase investment by 2.63 per cent.
Cambazogha and Karaalp (2012) analyse the effectiveness of the narrow credit view on
employment output for Turkey using monthly variables for the period 2005-2010. The results
indicate that changes in money stock (M2) impact on real variables such as employment and
output through the credit stock. Dickson and Liu (2007) show that there was an increasing
influence of interest rates on output over 1984 to 1997 and non-state-owned enterprises were
reacting to monetary policy changes in China.
Kapan and Minolu (2013) have shown that banks with strong balance sheets were better
able to maintain lending during the 2007-2009 global financial crisis. In particular, banks that
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were ex-ante more dependent on market funding and had lower structural liquidity reduced
the supply of credit more than other banks. It has been argued that financial intermediation
stimulates the funding of liquidity needs through credit lines (Allen and Gale, 2004; Shittu,
2012).
2.1 Monetary Transmission Mechanism, Credit Frictions and Macroprudetial
Regulation
The monetary transmission mechanism describes how policy induced changes in the
nominal money stock or the short-term nominal interest rates impact real variables such as
aggregate output and employment (Ireland, 2005). Specific channels of monetary
transmission operate through the effects that monetary policy has on interest rates, exchange
rates, equity and real estate prices, bank lending, and firm balance sheets. Recent research
shows how these channels work in the context of dynamic, stochastic general equilibrium
models.
Bernanke and Gertler (1995) classify three channels of monetary policy as the balance
sheet channel, the bank-lending channel and the credit channel. The balance sheet channel
focuses on monetary policy effects on the liability side of the borrowers’ balance sheet and
income statement, including variables such as borrowers’ networth, cash flow and liquid
assets whilst the bank lending channel centres on the possible effect of monetary policy
actions on the supply of loans by depository institutions.
However, most of the previous empirical literature on the effects of credit aims to
distinguish between different transmission mechanisms, such as the balance sheet channel, the
bank lending channel and the bank capital channel (see Oliner and Rudebusch, 1996; van den
Heuve, 2002). Since these different channels have similar predictions for aggregate
quantities, many empirical studies use micro-level data from banks and/or firms rather than
the aggregate data (Bayoumi and Melander, 2009). One consequence of these empirical
studies is that the general conditions of the banking sector and the specific characteristics of
individual banks can have predictable impacts on the monetary transmission mechanism. In
fact, recent studies have emphasised a risk-taking channel of monetary policy that places
more emphasis on the willingness of banks to expand their balance sheet (Borio and Zhu,
2012; Adrian and Shin, 2011). The works of Adrian and Shin (2011) provide an overview of
how changes in risk appetite, which is partly a function of monetary policy, generates a
critical link between monetary policy changes, the actions of financial intermediaries, and the
impact on the real economy.
Boivin et al (2010) have argued that the monetary transmission mechanism is one of the
most studied areas of monetary economics for two reasons. First, understanding how
monetary policy affects the economy is essential to evaluating what the stance of monetary
policy is at a particular point in time. Second, in order to decide on how to set policy
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instruments, monetary policy makers must have an accurate assessment of the timing and
effects of their policies on the economy.
Over the last two decades, beginning with the pioneering works of Bernanke and Gertler
(1989), economists began to introduce credit frictions into models that allowed for borrowing
and lending in equilibrium. A number of studies have shown that these credit frictions could
amplify the macroeconomic fluctuations introduced by certain shocks, hence the credit
frictions are often referred to as the “financial accelerator” (see Kiyotaki and Moore, 1997,
Carlstrom and Fuersto, 1997 and Bernanke, et al, 1999). The recent papers have contributed
to this literature by adding a relatively simple realistic, and well-defined financial
intermediation sector into a large-scale dynamic stochastic general equilibrium (DSGE)
model (Gertler and Kiyotaki, 2009; Curdia and Woodford, 2010). These works analyse the
relationship between the financial intermediation sector and macroeconomic volatility by
examining both the indirect effect of the sector on the propagation of non-financial shocks
and the direct effects of financial shocks that inhibit financial intermediation.
Tayler and Zilberman (2014) examine the macroprudential roles of bank capital
regulation and monetary policy in a Dynamic Stochastic General Equilibrium (DSGE) model
with endogenous financial frictions and a borrowing cost channel. The model identifies
various transmission channels through which credit risk, commercial bank losses, monetary
policy and bank capital requirements affect the real economy. These mechanisms generate
significant financial accelerator effects, thus providing a rationale for a macroprudential
toolkit. Following credit shocks, counter cyclical bank capital regulation is more effective
than monetary policy in promoting financial, price and overall macroeconomic stability. For
supply shocks, macroprudential regulation combined with a strong response to inflation in the
central bank policy rule yield the lowest welfare losses. The findings emphasise the
importance of the Basel III regulatory accords and cast doubts on the desirability of
conventional Taylor rules during periods of financial stress.
3. Data Sources and Methodology
The data for this study were generated from the Central Bank of Nigeria for the periods
1980-2010. The study variables are commercial bank lending to agriculture (CBLA),
commercial bank lending to manufacturing (CBLM), bank liquidity ratio (BLR), cash reserve
ratio (CRR), loan-to-total deposit ratio (LTDR), savings rate (SR), prime lending rate (PLR)
and maximum lending rate (MLR). The descriptive statistics are calculated for each of these
variables (mean and standard deviation).
The delineation of the variables into dependent and independent variables is specified in
the following multiple regression models:
(1) CBLA = + 1BLR + 2CRR + 3LTDR + i
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ί
ί
ί
(2) CBLM = + 1BLR + 2CRR + 3LTDR + i
(3) CBLA = + 1SR + 2PLR + 3MLR + i
(4) CBLM = + 1SR + 2PLR + 3MLR + i
The Software Package for Social Sciences (SPSS) was used to compute the variables in
the equation, the residual statistics, collinearity diagnostics and the relevant model
summaries.
The problem of multicollinearity, a situation in which the explanatory variables in
equations (1)-(4) are highly linearly correlated, is resolved by computing the VIF and
tolerance values as in equation (5).
(5) VIF = 1
1-R2
where VIF is Variance Inflation Factor, R2 is the coefficient of determination of the
regression equation. Note that tolerance = 1-R2
. A tolerance of 0.20 or 0.10 or less and/or a
VIF of 5 or 10 and above means there is high multicollinearity among the independent
variables (IVs), (Kutner, et al, 2004, O’Brien, 2007).
4. Empirical Results
The descriptive measures of mean and standard deviation are presented in Table 4 for the
study variables. Within the 1980-2010 period, average bank liquidity ratio (BLR) was 46.4
per cent, higher than the prescribed average of 27.7 per cent. The standard deviation of 3.46 is
associated with the bank liquidity ratio for the period.
The average cash reserve ratio for the study period was 6.0 per cent, with a standard
deviation of 3.46 per cent. In addition, the average loan-to-deposit ratio was 69.5 per cent, far
below the prudential maximum of 80.0 per cent. A standard deviation of 10.28per cent is
associated with the LTDR.
The average savings rate (SR) for the 1980-2010 period was 8.4 per cent, while the
average prime lending rate (PLR) was 17.4 per cent for the same period. The average
maximum lending rate (MLR) was 20.3 per cent. The computed standard deviation for SR is
4.91 per cent, PLR 5.35 per cent and MLR 6.25 per cent.
Only an average of 10.1 per cent of total credit to the real sector was allocated to
agriculture during the 1980-2010 period. The absolute variation in commercial bank lending
to the agricultural sector was 6.31 per cent in the same period. The average sectoral
allocation of credit to the manufacturing sector was 28.4 per cent in the 1980-2010 period,
with a standard deviation of 10.53 per cent.
Table 4: Bank Management, Interest Rates and Commercial Banks’ Lending to the
Agriculture and Manufacturing Sectors
S/N Description Mean Std. Dev.
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1 Bank Liquidity Ratio (Actual) 46.4 3.46
2 Bank Liquidity Ratio (Prescribed Minimum) 27.7 N/R
3 Cash Reserve Ratio (Prescribed) 6.0 3.46
4 Loan-to-Deposit Ratio (Actual) 69.5 10.28
5 Loan-to-Deposit Ratio (Prescribed Maximum) 80.0 N/R
6 Savings Rate 8.4 4.91
7 Prime Lending Rate 17.4 5.35
8 Maximum Lending Rate 20.3 6.25
9 Sectoral Allocation of Commercial Banks’ Credit
to Agriculture
10.1 6.31
10 Sectoral Allocation of Commercial banks’ Credit
to Manufacturing
28.4 10.53
Source: Author’s computation based on data from CBN Statistical Bulletin (1980-2010)
N/R - Not Relevant
4.1 Collinearity Diagnostics
The test of multicollinearity is summarised in Table 5. In all the four models, the
Variance Inflation Factors (VIFs) are less than 5.0, while the tolerance values are all above
0.2. Hence, employing the rules of thumb established by Kutner et al, (2004) and O’Brien
(2007), it is safe to say that the independent variables in Models 1-4 are not linearly
correlated, and hence the problem of multicollinearity does not exist.
Table 5: Relationship between Lending and Agricultural Contribution to GDP
Model Variables
Independent Variables*
CBLA MBLA
B -0.0015 0.2771
SE B -.1061 0.1534
95% Confdnce -0.2264 -0.0480
Interval B 0.2233 0.6022
Beta () -0.0039 0.4822
SE Beta 0.2669 0.2669
Correl. 0.2708 0.4800
Part. Cor. -0.0032 0.3963
Partial -0.0036 0.4116
t-test -0.0150 1.8070
Sig.t (0.05) 0.9886 0.0897 B Constant = 30.7326 SE B Constant = 1.4269 Interval BConstant = 33.7574
t Constant = 21.539 Sig t. Const = 0.000 * Dependent variable is agricultural contribution to GDP (ACGDP)
4.2 Inferential Results
The results in Table 6 show the relationship between bank management and commercial
bank lending to agriculture (CBLA). With a beta coefficient () of -0.2052, we find that as
bank liquidity ratio (BLR) increases by 100 per cent, commercial bank lending to agriculture
in the 1980-2010 period fell by 20.52 per cent and vice versa. With a critical t-value of
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0.2917, a t-test statistics of -1.0760 shows that both the beta and correlation coefficients are
significant and show an inverse relationship between BLR and CBLA. Moreover, with a beta
coefficient of -0.1736, we find that as the cash reserves ratio increases by 100 per cent,
commercial bank lending to agriculture reduces by 17.36 per cent and vice versa. The inverse
correlation between CRR and commercial bank lending to agriculture is statistically
significant at the 5% level, as the t-test of -0.9080 falls outside the critical region of 0.3717.
The sensitivity of commercial bank lending to agriculture (CBLA) to the loan-to-deposit ratio
(LTDR) of banks is further explained by a beta coefficient of -0.3661. This means that as the
loan-to-deposit ratio (LTDR) rises by 100 per cent, the sectoral allocation of bank credit to
the agricultural sector falls by 36.61 per cent and vice-versa. The beta and correlation
coefficients are significant at the 5 per cent level of significance with the t-test statistic of -
1.9780 falling outside the critical regions of 0.0582.
Table 6: Relationship between Bank Lending and Manufacturing Contribution to GDP
Model Variables
Independent Variables*
CBLM MBLM
B -0.0734 0.0099
SE B 0.0592 0.0698
95% Confdnce -0.1989 -0.1382
Interval B 0.0521 0.1579
Beta () -0.2960 0.0337
SE Beta 0.2388 0.2388
Correl. -0.2976 0.0483
Part. Cor. -0.2956 0.0337
Partial -0.2959 0.0353
t-test -1.3390 0.1410
Sig.t 0.2331 0.8896
B Constant = 42.0221 SE B Constant = 3.4957 Interval BConstant = 49.4326
t Constant = 12.021 Sig. t. Const = 0.000
* Dependent variable is Manufacturing contribution to GDP (MCGDP)
Table 7 shows the beta and correlation coefficients for the manufacturing sector. A beta
coefficient of -0.2064 means that as bank liquidity ratio (BLR) rises by 100 per cent, we
should expect commercial bank lending to the manufacturing sector to decline by 20.64 per
cent and vice-versa. The beta coefficients are -0.1750 for the cash reserve ratio (CRR) and -
0.3106 for the loan-to-deposit ratio (LTDR). These beta coefficients are significant at the 5%
level of significance.
Table 7: Effects of Bank Management on Commercial Bank Lending to the
Manufacturing Sector
Model Variables
Independent Variables*
LTDR BLR CRR
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B -0.3183 -0.2258 0.5333
SE B 0.1920 0.2114 0.5896
Beta () -0.3106 -0.2064 0.1750
SE Beta 0.1874 0.1932 0.1935
Correl. -0.3039 -0.0688 0.1822
Part. Cor. -0.2958 -0.1906 0.1614
Partial -0.3040 -0.2014 0.1715
t-test -1.6580 -1.0680 0.9040
Sig.t 0.1089 0.2949 0.3737
* The dependent variable is commercial bank lending to manufacturing (CBLM)
The results in Table 8 show the effects of bank rates on commercial bank lending to the
agricultural sector. The beta coefficient of the maximum lending rate (MLR) is -0.1195. This
means that as the MLR rises by 100 per cent, the commercial bank lending to agriculture
(CBLA) falls by 11.95 per cent and vice-versa. In terms of the prime lending rate (PLR), the
beta coefficient is 0.1272, and the correlation coefficient is 0.3344. The sensitivity of
commercial bank lending to agriculture to the prime lending rate (PLR) is positive and
significant. As the prime lending rate rises by 100 per cent, CBLA rises by 12.72 per cent and
vice versa. Commercial bank lending to agriculture is more sensitive to a fall in the prime
lending rate (PLR), than an equivalent fall in maximum lending rate (MLR).
The critical beta coefficient of 0.8417 for savings rate (SR), and the corresponding
correlation coefficient of 0.8556, show that commercial bank lending to agriculture is much
more sensitive to changes in the savings rate. As the savings rate rises by 100 per cent, CBLA
rises by 84.17 per cent and vice versa. The positive correlation between SR and CBLA is
significant at the 5% level.
Table 8: Effects of Bank Rates on Commercial Bank Lending to the Agricultural Sector
Model Variables
Independent Variables*
MLR SR PLR
B -0.1209 1.0809 0.1502
SE B 0.1816 0.1364 0.2189
Beta () -0.1195 0.8417 0.1272
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SE Beta 0.1795 0.1062 0.1854
Correl. 0.2157 0.8556 0.3344
Part. Cor. -0.0657 0.7823 0.0677
Partial -0.1271 0.8363 0.1309
t-test -0.6660 7.7250 0.6860
Sig.t 0.51110 0.0000 0.4985
* The dependent variable is commercial bank lending to agriculture (CBLA)
MLR (Maximum Lending Rate), SR (Saving Rate), PLR (Prime Lending Rate)
The results in Table 9 show a negative beta coefficient of -0.1508 and an insignificant
inverse correlation coefficient of 0.10288. However, as the maximum lending rate (MLR)
rises by 100 per cent, the commercial bank lending to manufacturing falls by 15.08 per cent
and vice versa. The prime lending rate (PLR) has a beta coefficient of 0.0942 and a
correlation coefficient of 0.2030, and both coefficients are insignificant at the 5% level, since
the computed t-statistic of 0.3400 falls within the critical region of 0.7363. However, the
savings rate (SR) has a beta coefficient of 0.6434, and a correlation coefficient of 0.6367.
Both coefficients are significant since the t-test statistic of 4.0560 falls outside the critical
regions of 0.0004 at the 5% level. The results suggest that as savings rate rises by 100 per
cent, we should expect commercial bank lending to manufacturing to rise by 64.34%, and
vice versa. There is a significant and positive correlation between SR and CBLM.
Table 9: Effects of Bank Rates on Commercial Bank Lending on the Manufacturing Sector
Model Variables
Independent Variables*
MLR SR PLR
B -0.2546 1.3790 0.1856
SE B 0.4526 0.3400 0.5457
Beta () -0.1508 0.6434 0.0942
SE Beta 0.2680 0.1586 0.2770
Correl. 0.10288 0.6367 0.2030
Part. Cor. -0.0829 0.5779 0.0501
Partial -0.1977 0.6153 0.0653
t-test -0.5630 4.0560 0.3400
Sig.t 0.5783 0.0004 0.7363
* The dependent variable is commercial bank lending to manufacturing (CBLM)
The model summary results are shown in Table 10. The coefficient of determination (R2),
and the F-ratio show the significance of the variation in the dependent variables (CBLA and
CBLM). Model 1 has an R2 of 0.1615, meaning that 16.15 per cent of the variation in
commercial bank lending to agriculture (CBLA) is explained by changes to critical bank
management ratios. The explanatory power of the independent or predictor variables in
Model 2 is 14.05 per cent. With a coefficient of determination of 0.7370, Model 3 shows that
73.70 per cent of the variations in agricultural lending is explained by bank rates. Model 4
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s
has an R2 of 0.4133, showing that only 41.33 per cent of the variations in both credits to
manufacturing is explained by changes in bank rates. In all the four models, the computed R2
are significant since the F-ratio falls outside the critical regions.
Table 10: Effects of Bank Policy on Commercial Bank Lending to Agriculture and
Manufacturing: Model Summary Results
Summary Model 1 Model 2 Model 3 Model 4
Mult R 0.4019 0.3748 0.8585 0.6429
R2 0.1615 0.1405 0.7370 0.4133
Adj. R2 0.0684 0.0450 0.7077 0.3481
F-ratio 1.7340 1.4710 25.2160 6.3400
Sig. F 0.1840 0.2450 0.000 0.0020
RsqCh 0.1615 0.1405 0.7370 0.4133
S.E. 6.1914 10.4620 8.6438 3.46781
Model 1 CBLA = a + b1 BLR + b2CRR + b3LTDR + i
Model 2 CBLM = a + b1 BLR + b2CRR + b3LTDR + i
Model 3 CBLA = a + b1 SR + b2PLR + b3 MLR + i
Model 4 CBLM = a + b1 SR + b2PLR + b3MLR + i
5. Summary and Conclusion
Within the 1980-2010 period under investigation, the average bank liquidity ratio (BLR)
was 46.4 per cent, well above the prescribed average of 27.7 per cent. The average cash
reserve ratio (CRR) was 6.0 per cent, portraying easy monetary policy regime. However, the
average loan-to-deposit ratio (LTDR) was 69.5 per cent, below the prescribed the prudential
maximum of 80.0 per cent. The incidence of funding risk exceeded the liquidity risk that
banks were exposed to. The average margin that banks reaped from the difference between
savings rate and maximum lending rate was 11.9 per cent. An average of 10.1 per cent of the
total bank credit was allocated to the agricultural sector during the 1980-2010 period. The
average allocation of credit to the manufacturing sector was 28.4 period. However, the
difference for the manufacturing sector in the sectoral allocation of bank credit over the
period is unexplained.
In the four specified models, the Variance Inflation Factors (VIFs) are less than 5.0, while
the tolerance values are all above 0.2. Hence, the problem of multicollinearity does not exist
among the independent variables (IVs). The beta and correlation coefficients show a
significantly inverse relationship between bank liquidity ratio (BLR) and commercial lending
to agriculture. There is also a significantly inverse correlation between cash reserves ratio
(CRR) and commercial bank lending to agriculture (CBLA). However, CBLA is more
sensitive to the banks’ loan-to-deposit ratio (LTDR).
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The banks’ sectoral allocation of credit to the agricultural and manufacturing sectors was
not significantly sensitive to changes in the prime lending rate (PLR) and the maximum
lending rate (MLR). However, the allocation of bank credit to these two critical sectors was
largely influenced by changes in the savings rate. The explanatory powers of bank rates in
determining the allocation of bank credit to agriculture and manufacturing were more
significant in the overall model results.
Overall, the robust liquidity profiles of the banks, far above the prescribed minimum, did
not improve their funding of the real sector. Most enterprises in the agricultural and
manufacturing sectors groaned under increasing funding risk, although for most of the period,
the Central Bank of Nigeria (CBN) pursued an easy monetary policy regime, with less
variation in the cash reserve requirements. The banks seemed to be more interested in
reaping from wide margins between savings rate and maximum lending rate. The significant
variation in the maximum lending rate could suggest the rationing of credit in sectors
considered too risky to invest in, and the systematic exclusion of the non-prime borrowers.
Bank management decisions were significantly insensitive to the credit needs of the
agricultural and manufacturing sectors. Apparently, bank lending rates did not assume a
declining trend, inspite of easy monetary policy. The limited sectoral allocation of bank
credit to these two sectors could have been explained by increasing risk aversion by the
banks, in sheer preference for rent-seeking and short-term financing.
For a period of 21 years, the regulatory authorities failed to utilise the relevant monetary
policy regimes to direct bank credit to the agricultural and manufacturing sectors. The
seeming paternalism might have led to the abolition of the mandatory sectoral allocation of
credit, easy monetary policy stance and prudential lapses, thereby giving the commercial
banks an ample opportunity to build their liquidity profiles and resolve the banking dilemma
at the expense of funding the real sector.
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