Emerging Equity Market Volatilitycharvey/Research/Working...Emerging Equity Market Volatility∗...
Transcript of Emerging Equity Market Volatilitycharvey/Research/Working...Emerging Equity Market Volatility∗...
Emerging Equity Market Volatility∗
Geert Bekaerta, Campbell R. Harveyb
aStanford University, Stanford, CA 94305, USA, National Bureau of EconomicResearch, Cambridge, MA 02138, USA
bDuke University, Durham, NC 27708, USA, National Bureau of Economic Research,Cambridge, MA 02138
Abstract
Understanding volatility in emerging capital markets is important for determining the costof capital and for evaluating direct investment and asset allocation decisions. We provide anapproach that allows the relative importance of world and local information to change throughtime in both the expected returns and conditional variance processes. Our time-series andcross-sectional models analyze the reasons that volatility is different across emerging markets,particularly with respect to the timing of capital market reforms. We find that capital marketliberalizations often increase the correlation between local market returns and the world marketbut do not drive up local market volatility.
Key words: Emerging markets, volatility, capital market reforms
JEL classification: G15, G11, G12
Correspondence to: Professor Campbell R. Harvey, The Fuqua School of Business, Duke Uni-versity, Box 90120, Durham, NC 27708-0120, USA, E-mail: [email protected].
∗We have benefited from the comments of Tim Bollerslev, Silverio Foresi, Rene Garcia, WillGoetzmann, Stephen Gray, Philippe Jorion, Jianping Mei, Steve Ross, and seminar partici-pants at New York University, Northwestern University, Yale University, Georgetown Univer-sity, Tilburg University, Southern Methodist University, Stanford University, the InternationalMonetary Fund, the CIRANO-C.D.R.E. Conference on Stochastic Volatility in Montreal, the1995 American Finance Association Meetings in Washington, and the 1995 European FinanceAssociation Meetings in Milan. We especially appreciate the detailed comments of the ref-eree, Richard Roll, which greatly improved the paper. Harvey’s research was supported bythe Batterymarch Fellowship. Bekaert acknowledges the financial support of an NSF grantand the Financial Research Initiative of the Graduate School of Business at Stanford. Wethank Arman Glodjo, Akhtar Siddique, Guojun Wu, and Nese Yildiz for research assistance.We especially appreciate the research assistance of Magnus Dahlquist and Angela Ng. E-mail:bekaert [email protected] and [email protected].
1. Introduction
It is now well known that emerging market equities have vastly different char-
acteristics than equities from developed capital markets. There are at least four
distinguishing features of emerging market returns: average returns are higher,
correlations with developed market returns are low, returns are more predictable
and volatility is higher. Our research focusses on this last feature.
We provide a detailed analysis of equity market volatility in emerging capi-
tal markets. We attempt to answer the question of why volatility is so different
across emerging equity markets. This is an important question. In segmented
capital markets, risk premiums may be directly related to the volatility of equity
returns in the particular market. Higher volatility implies higher capital costs.
Higher volatility may also increase the value of the “option to wait,” hence delay-
ing investments. Our research helps understand the forces that shape both the
time-series variation and cross-sectional dispersion of volatility in twenty emerging
equity markets.
We begin by analyzing the time-series of volatility. Given the evidence of
nonnormalities in emerging market returns presented in Harvey (1995a), it is
unlikely that the standard implementation of the Engle (1982) and Bollerslev
(1986) autoregressive conditional heteroskedasticity (ARCH) models is fruitful.
We address this problem by estimating models using the student t distribution
which allows for fatter tails in the return distributions. We also fit models using
the semi-parametric ARCH (SPARCH) model developed in Engle and Gonzalez-
Rivera (1991) and Gray (1994). The SPARCH model is explicitly designed to
account for leptokurtosis and skewness. This model is particularly appropriate
for emerging market returns which exhibit both types of nonnormalities.
We are careful to link previous research on the conditional means of the
emerging market returns to the conditional variance specifications. Since Har-
vey (1995a), Bekaert (1995) and Bekaert and Harvey (1995) show that emerging
market equity returns are predictable, our variance specifications allow for time-
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varying conditional means.
Much of the focus of our paper is on the common world factors that drive the
time-series of volatility. This part of our research is related to the work of Schwert
(1989a,b) who attempts to explain the time-variation in U.S. market volatility
with macroeconomic and microstructural factors. In our analysis, we measure
the part of national volatility that is determined by world factors and the part
determined by local market effects. We also investigate whether this proportion
changes through time. We argue that the increasing influence of world factors
on volatility in some countries is consistent with increased market integration.
This analysis is related to the time-varying market integration parameter that is
proposed in Bekaert and Harvey (1995).
In addition to tracing the influence of world factors on market volatility, we
investigate whether capital market liberalization policies affect volatility. The
evidence in Kim and Singal (1994), based on average volatilities, suggests that
volatility may increase. Our methodology allows us to reexamine this issue in the
context of time-varying means and variances. As is clear from Bekaert, Garcia
and Harvey (1995a), insight on this issue is of great importance for policy makers
in developing markets whom may be weighing the costs and benefits of various
liberalization initiatives.
To control for other factors affecting volatility, we extend our analysis to the
cross-section of volatility. This allows us to explore the question: Why is volatility
different in different markets? We investigate whether the volatility is related to
the number of stocks in the national index, asset concentration and the cross-
sectional volatility of the individual stocks within each country’s index. We also
examine whether volatility is related to variables capturing financial and economic
integration such as market capitalization to GDP, exports plus imports to GDP
and country credit risk ratings. Finally, following Schwert (1989a,b), we examine
variables capturing macroeconomic volatility.
The paper is organized as follows. The second section presents the distri-
butional characteristics of the emerging market data. The results of estimating
time-series volatility models are presented in the third section. This section also
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includes an analysis of asymmetric volatility effects. The fourth section decom-
poses volatility into the parts determined by world and local factors. In the fifth
section, we present an analysis of the cross-sectional patterns in volatility and
detail how capital market reforms affect volatility. Some concluding remarks are
offered in the final section.
2. Data and summary statistics
2.1 Sources and preliminary analysis
Data are available for 20 emerging markets from the International Finance Corpo-
ration (IFC) of the World Bank. Summary statistics are presented in Table 1 for
the period 1976.01 to 1992.12. U.S. dollar returns are displayed. The statistics in-
clude the average (annualized) arithmetic return, annualized standard deviation
and the first order autocorrelation. Each country’s return is based on a value-
weighted portfolio of securities that trade in that market. The number of stocks
included in the country indices ranges from 16 to 77. Stocks are selected for in-
clusion based on liquidity (how often they trade and the volume of trading) and
size (market value). The industrial composition of the index is also important.
That is, if there are two securities with approximately the same size and liquidity,
the security which makes the index better reflect the industrial composition of the
local market may be chosen. All of the indices reflect total returns: dividends and
capital gains. The IFC indices are detailed and compared to the better known
Morgan Stanley Capital International (MSCI) indices for developed markets in
Bekaert and Harvey (1995) and Harvey (1995a)
The mean U.S. dollar returns for the emerging markets range from 68% (Ar-
gentina) to -12% (Indonesia whose sample only begins in January 1990). This
sharply contrasts with the range of average returns in the developed markets. For
example, Bekaert (1995) and Harvey (1993) show that no developed country has
an average arithmetic return that exceeds 25% over the same time period. In
the IFC emerging sample, 8 countries (Argentina, Chile, Colombia, Philippines,
Portugal, Taiwan, Turkey and Venezuela) have returns that average above 25%.
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As mentioned earlier, the emerging market returns are characterized by high
volatility. Volatility ranges from 18% (Jordan) to 104% (Argentina). In contrast,
the MSCI countries have a range of volatility between 15% and 33%. There are
12 emerging countries with volatility higher than 33% (Argentina, Brazil, Chile,
Greece, Mexico, Nigeria, Philippines, Portugal, Taiwan, Turkey, Venezuela, and
Zimbabwe). Three additional countries have volatility greater than 30% (Colom-
bia, Indonesia, and Korea). Both the range and the magnitude of the volatilities
is much greater than found in developed markets. Using the same sample, Harvey
(1993) finds that volatility in developed markets ranges from 15% (U.S.) to 33%
(Hong Kong) with an equally-weighted average volatility of 23%.
The autocorrelation measures the persistence (or predictability) of the mar-
ket returns based on past market returns. This persistence could be driven by
market imperfections, such as infrequent trading of the component securities, or
by some fundamental forces, such as predictable changes in sensitivities to world
risk factors. In the MSCI sample, there are only five countries with first-order au-
tocorrelation that exceeds 10%. In the emerging countries, there are 12 countries
with autocorrelations greater than 10%. Indeed, there are eight countries with
autocorrelations above 20% (Colombia, Indonesia, Mexico, Pakistan, Philippines,
Portugal, Turkey, and Venezuela). Although the sample is shorter for some of
these countries and the standard errors of the autocorrelations are higher, the ev-
idence suggests that the returns in many of the emerging markets are predictable
based on past information.
In focussing on these emerging equity markets, a natural concern arises re-
garding potential survivorship biases. Harvey (1995a) shows that the pre-1981
data is ‘backtracked’ by the IFC. That is, firms where chosen for inclusion in nine
countries in 1981, and the series were filled back to 1976. However, his analysis
shows little difference between the 1976-80 and the later data. More fundamen-
tally, one could argue that the sample countries are the countries that ‘emerged.’
That is, the countries that did not perform well economically over the sample, were
not likely to make it into the IFC emerging markets index. While this is a valid
argument, it is also true for any stock index (like the S&P 500). In contrast with
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standard market indices, the sample of countries that we look at includes coun-
tries that have not done particularly well in economic performance (like Nigeria
and Zimbabwe).
2.2 Distributional characteristics
Evidence that many of the emerging market returns depart from normality is
also presented in table 1. If the data are normally distributed, then the coefficients
of skewness and excess kurtosis should be equal to zero. Richardson and Smith
(1993) and Harvey (1995a) test normality of equity returns based on Hansen’s
(1982) generalized method of moments (GMM). The following system of equations
is estimated for each asset i:
e1it =rit − µi
e2it =(rit − µi)2 −Vi
e3it =[(rit − µi)3]/V3/2i − sk
e4it =[(rit − µi)4]/V2i − 3 − xku
(1)
where µ is the mean, V is the variance, sk is the skewness, xku is the excess
kurtosis, et = {e1it e2it e3it e4it}′ represents the disturbances andE[et] = 0. There
are four orthogonality conditions and four parameters which implies the model is
exactly identified. The null hypothesis that the coefficients of skewness and excess
kurtosis are zero is tested with a Wald test.1
The null hypothesis of unconditional normality can be rejected at the 5% level
in 15 of the 20 emerging markets when measured in U.S. dollars. These results are
consistent with those reported in Harvey (1995a) and Claessens, Dasgupta and
Glen (1994). In contrast, Harvey (1995a) fails to reject unconditional normality
in the three largest developed markets, the U.S., Japan and the U.K.
1 Richardson and Smith (1993) present this general framework. However, ourweighting matrix is based on the spectral density at frequency zero with an optimalbandwidth which follows Andrews (1991). An alternative approach, presented inHarvey (1995a), is to set sk and xku equal to zero and estimate an overidentifiedsystem. This results in a χ2 test with two degrees of freedom.
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3. Characterizing variance in emerging markets
3.1 Conditional variance estimation with nonnormal returns
We examine the following GARCH(1,1) model of volatility:
ri,t =X′i,t−1δi + εi,t
εi,t =σi,tzi,t
σ2i,t =wi + αiσ
2i,t−1 + βiε
2i,t−1
(2)
where ri,t represents the arithmetic return2 on the national equity index of country
i in U.S. dollars, Xi,t−1 represents a set of local information variables that affect
the conditional mean, σ2i,t is the conditional variance and zi,t are the standardized
residuals formed by dividing the residuals, εi,t by the volatility, σi,t.
This model of volatility is univariate in the sense that other countries’ volatil-
ities do not influence the predictions and there is no attempt to model the covari-
ance dynamics. We think of this model as the “fully segmented” model. Consistent
with this view, we allow local information variables, Xi,t−1, rather than global in-
formation variables, to affect the conditional mean returns. In particular, local
information variables include: a constant, the lagged equity return, the lagged
exchange rate change, the lagged dividend yield and lagged market capitalization
to GDP. In section four, we introduce a world factor model which allows for global
influences on both the mean and volatility.
There are three different distributional assumptions in the general model:
Model I : zi,t|It−1 ∼ N(0, 1)
Model II : zi,t|It−1 ∼ tν(0, 1)
Model III : zi,t|It−1 ∼{N(µi1, σi1), w.p. pi;N(µi2, σi2), w.p. (1 − pi).
(3)
where It−1 is the information set available to investors at t − 1. The first model
is the standard normal formulation. The second model introduces a t distribution2 In order to provide a direct link with the asset pricing models presented in
section 4, we use arithmetic rather than geometric returns. We have estimatedthe model for several countries using log returns yielding similar results to theones obtained using arithmetic returns.
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with ν degrees of freedom. This is a one-parameter extension of model I. While
able to accommodate fat tails, the assumed distribution is symmetric in model II.
The third model is designed to capture both fat tails and skewness (which
quite a few of the emerging markets exhibit). Model III is a parsimonious ver-
sion of semi-parametric ARCH [see Engle and Gonzalez-Rivera (1991) and Gray
(1995a,b)]. Since in ARCH models, the conditional mean of the standardized
residuals is equal to zero and the conditional variance is equal to one, additional
constraints need to be imposed:
µ2 =−pµ1
1− p
σ2 =
√1 − pσ2
1 − (pµ1 + (1 − p)µ22)
1 − p
(4)
Hence, this model is a three parameter extension of the standard model.
We are also interested in asymmetric variance effects. Black (1976), Christie
(1982), Nelson (1991) and Glosten, Jagannathan and Runkle (1993) pursue the
intuition that variance is higher when market returns are negative. One expla-
nation is that the leverage of the firm increases with negative returns inducing a
higher volatility. It is most likely that these leverage effects will be found in firms
which already employ considerable debt financing. While we do not have data on
the debt-equity ratios of the individual firms in the emerging markets, many of
the countries themselves are highly levered. Hence, it seems important to allow
for the possibility of asymmetries in the variance function.
To accommodate asymmetries, we modify the third equation in (2) with:
σ2i,t = wi + αiσ
2i,t−1 + βiε
2i,t−1 + γiSi,tε
2i,t−1 (5)
where Si,t is an indicator variable:
Si,t ={
1, if εi,t−1 < 00, if εi,t−1 ≥ 0 .
This is the Glosten, Jagannathan and Runkle (1993) and Zakoian (1990) model.3
If negative returns increase volatility, γi > 0. This model allows us to test for
asymmetries in the volatility of emerging equity returns.3 Engle and Ng (1993) found this model to perform better than other asym-
metric models in Monte Carlo experiments.
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3.2 Results
A detailed analysis of the estimation of the univariate, segmented models is
contained in Appendix A. We will briefly summarize these results. Table 2 sum-
marizes the final volatility model chosen for each country. The selection criteria
are based on the model diagnostics, parameter values and a visual examination of
the fitted variances.4 If a number of models are similar, the most general model
is chosen. In most cases, the choice of model was straight forward. However, with
five countries, Indonesia, Jordan, Nigeria, Taiwan and Turkey, the choices were
more difficult.
Our diagnostics are generalized method of moments based tests of the correct
specification of the conditional mean, conditional variance and first four uncondi-
tional moments of the standardized residuals (zi,t). Consequently, these tests are
quite demanding. Overall, the tests reveal evidence against the null hypothesis
for almost all countries. Clearly, the GARCH models have difficulty fitting the
highly volatile and nonnormal returns.
In general, the asymmetric GARCH provides an improvement in fit for most
of the countries in our sample. Surprisingly, negative return innovations appear
to decrease volatility in most countries, i.e. γi is estimated to be negative. This
is the opposite to what would be predicted based on the leverage hypothesis. A
potential explanation derives from survivorship bias.5 The markets in our sample,
with a few exceptions, are the ones that have emerged as successful stock markets.
For markets to survive, volatility ought to decrease (at least some of the times)
when markets are hit with negative shocks. This potentially explains the negative
relation between volatility and returns shocks.
Finally, our tests reveal that for some countries, the conditional mean spec-
ification may not be adequate. The tests reveal that there is significant serial
4 In this estimation, we constrained α + β ≤ 1, even when asymmetric effectswere allowed for. We reestimated all models for which this constraint was bindingrelaxing the constraint. Although α + β > 1 means covariance stationarity isviolated, the process may still be strictly stationary. Our cross-sectional analysisuses the estimates where the constraint is not imposed.
5 We thank Steve Ross for this suggested interpretation.
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correlation in the standardized residuals in a number of countries.
While some estimations seem ill-behaved or are rejected, it is remarkable that
the different models yield quite similar volatility behavior over time. Although
we believe that the simple model in (2) captures an important part of the time-
variation in conditional variances, the specification tests indicate that we may be
missing some interesting dynamics. In particular, the assumption of having only
local variables and shocks affecting conditional means and variances may be too
restrictive.
4. World versus local factors in volatility
4.1 Model specification
In integrated world capital markets, shocks to the world market return affect
all countries who have nonzero covariances with the world market. Bekaert and
Harvey (1995) develop a model of the conditional mean return in emerging markets
which allows for time-varying influences of both local and world factors. We
apply the same type of intuition to our variance model. That is, as a market
becomes more integrated both the conditional mean and the variance should be
more influenced by world factors.
The following model allows for world and local influences in both the condi-
tional means and variances. First, consider a model that describes world market
returns and variances:
rw,t = δ′wXt−1 + εw,t
σ2w,t = cw + αwσ
2w,t−1 + βwε
2w,t−1,
(6)
where Xt−1 represents a set of world information variables which include: a con-
stant, the world market dividend yield in excess of the 30-day Eurodollar rate,
the default spread (Moody’s Baa minus Aaa bond yields), the change in the term
structure spread (U.S. 10-year bond yield minus 3-month U.S. bill), and the change
in the 30-day Eurodollar rate. These variables are designed to capture fluctuations
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in expectations of the world business cycle. All of these information variables are
lagged.
Following Bekaert and Harvey (1995), we allow the mean return in country i
to be a function of both world and local information:
ri,t = θi,t−1κiδ′wXt−1 + (1 − θi,t−1)(δ′
iXi,t−1) + εi,t, (7)
where Xi,t−1 represents the local information variables: a constant, the equity
return, the exchange rate change, and the dividend yield, all of which are lagged.
The influence of world and local information on the emerging market’s expected
return is allowed to change through time.6 The parameter, θi,t−1, represents the
importance of the world information variables. We restrict:
θi,t−1 =(λ′
iX∗i,t−1)
2
1 + (λ′iX
∗i,t−1)2
(8)
to fall in the range [0,1]. We consider a number of variables for X∗i,t−1 which
might proxy for the degree of integration. When capital markets open up to
foreign investment, the change of the marginal investor typically results in an
increase in market capitalization to GDP. Finally, we consider the size of the trade
sector (exports plus imports divided by GDP). International trade may enhance
the cross-country correlation of consumption and business-cycles which, in turn,
might lead to prices of risk and/or risk exposures moving together – even when
capital markets are segmented. Note that the quadratic relation in (8) implies that
the relation between X∗i,t−1 and θi,t−1 need not be monotonic over the sample.
This is useful when market capitalization increases because of local factors, for
example, the introduction of a private pension plan.7
We allow the shocks to the local returns to be driven by both world and local
shocks:
εi,t = ξiψi,t−1εw,t + ei,t (9)
6 The evidence in Garcia and Ghysels (1994) suggests that if expected returnsin emerging markets are conditioned exclusively on world information variables,there is evidence of structural instability in linear models.
7 We experimented with logistic functions but found estimation to be muchbetter behaved with quadratic functions.
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where ξi is a scale parameter and ψi,t−1 represents the importance of the world
shock which is also restricted to fall in the [0,1] range.
ψi,t−1 =(ζ′
iX∗i,t−1)
2
1 + (ζ′iX
∗i,t−1)2
. (10)
As with θi,t−1, ψi,t−1 is time varying and a function of local information which
proxies for the degree of integration.
We impose additional restrictions:
(a) E[ei,tei,j |It−1] = 0 ∀i 6= j
(b) E[ei,tεw,t|It−1] = 0 ∀i
(c) E[e2i,t|It−1] = (σ`i,t)
2 = ci + αi(σ`i,t−1)
2 + βie2i,t−1.
(11)
This model implies:
E[ε2i,t|It−1] = σ2i,t = ξ2i ψ
2i,t−1σ
2w,t + (σ`
i,t)2 (12)
and
E[εi,tεw,t|It−1] = ξiψi,t−1σ2w,t = σiw,t. (13)
This model is related to, but different from, the factor ARCH models of
Engle, Ng and Rothchild (1990, 1992), King, Sentana and Wadhwani (1994) and
Diebold and Nerlove (1989). In these models, a world factor is allowed to influence
volatility at a constant rate. In the special case where θi,t−1 = ψi,t−1 = 1 for
all t, the variance model is similar to the Engle, Ng and Rothchild model. If
θt−1 = 1 and δwXt−1 is the world market premium, then the κi coefficient in the
conditional mean specification can be interpreted as the constant factor loading in
a world capital asset pricing model. These factor models also imply the restriction
κi = ξi. Below we will perform tests of κi = ξi and θi,t−1 = ψi,t−1 both jointly
and separately.
Unlike our previous models, this specification allows for both local and world
influences in the mean and the variance. Importantly, the influence, in both cases,
is allowed to change through time as a function of local variables which contain
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information regarding the country’s degree of financial and economic integration
with world economic markets.
The covariance dynamics of our model have two important implications.
First, the covariance with the world market return is positively related to the
degree of market integration. Second, the covariance with the world return in-
creases in times of high world market volatility. As such, our results contribute
to the literature on international stock market linkages.8
The two stylized facts often noted in this literature are that the process of
globalization and deregulation has increased the correlations between stock mar-
kets over time and that the correlation between markets rises in periods when the
volatility of markets is large (for example, around the October 1987 crash). The
empirical evidence, particularly on the first fact, is mixed, however. For example,
although Longin and Solnik (1994) document an upward trend in international
correlations, King, Sentana and Wadhwani (1994) argue that the increase in cor-
relations may be transitory and related to the October 1987 crash.
The world market correlation in our model is given by:
ρit = ξiψi,t−1σw,t
σi,t. (14)
Hence, correlations increase when markets become more integrated or when world
market volatility is high relative to local volatility. The latter mechanism is the
only one present in the model of King, Sentana and Wadhwani (1994) to induce
higher correlations between markets. A trend in the correlations can only arise
when the factors in their model exhibit integrated GARCH behavior. Below we
will graph the conditional correlations implied by the model. We will also inves-
tigate their behavior post-crash and post-capital market liberalization relative to
the full sample.
Nevertheless, the assumptions in (11) are quite restrictive. Any misspecifi-
cation will also result in misspecification of the covariance term. For example,
8 See, King and Wadhwani (1990), Longin and Solnik (1994) and King, Sentanaand Wadhwani (1994). Erb, Harvey and Viskanta (1994) show that correlationsare higher in down markets and during recessions.
12
as long as ξi is positive, the covariance with the world return can never become
negative. Therefore, we estimate a more general covariance model:
σiw,t = ki + fiψi,t−1σ2w,t + gi(σ`
i,t)2 (15)
where fi 6= ξi. We refer to this model as the “extended model.” If our represen-
tation is true, we should find:ki = 0
fi = ξi
gi = 0.
(16)
These restrictions are testable.
One additional diagnostic of the model involves its implications for the cor-
relations between emerging markets. Since we have 20 different markets in our
sample, joint estimation for all countries is computationally infeasible. As a result,
we concentrate our attention on bivariate models. Our model implies:
E[ut|It−1] = 0
with ut = εi,tεj,t − ξiξjψi,t−1ψj,t−1σ2w,t
(17)
and note that the correlation coefficient is
ρij,t =ξiξjψi,t−1ψj,t−1σ
2w,t
σ2i,tσ
2j,t
. (18)
It is well known that cross correlations between emerging markets are small. Our
model may help us understand why the correlations are small. The correlations
between markets are directly linked to their degree of integration in world capital
markets.
Finally, we examine the proportion of local variance accounted for by world
factors. The following variance ratio is computed:
VRi,t =ξ2i ψ
2i,t−1σ
2w,t
σ2i,t
∈ [0, 1]. (19)
Using the definition in (13), we can equivalently write:
VRi,t =ξiψi,t−1σiw,t
σ2i,t
. (20)
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The variance ratio can be decomposed into three pieces:
ξiψi,t−1︸ ︷︷ ︸Degreeof integration
σiw,t
σi,tσw,t︸ ︷︷ ︸Correlation
σw,t
σi,t︸︷︷︸Volatility ratio
.
V Ri,t gives an indication of the proportion of the conditional variance that cannot
be accounted for by the fully segmented model from section 3. We will also
examine the time-variation in V Ri,t post-crash and post-liberalization.
4.2 Estimation and specification tests
We estimate (6) using maximum likelihood assuming normal innovations.
These parameter estimates are then held fixed in the actual maximum likelihood
estimation of the bivariate model. We report White (1982) standard errors that
are robust to misspecification of the distribution of the error terms. However, we
do not correct for the sampling error of the world market model parameters in the
first-stage estimation. This approach yields consistent but not necessarily efficient
estimates.
Important assumptions underlying our bivariate country by country esti-
mation are: (1) The density of rw,t conditional on It−1 depends on θw =
[δ′w, cw, αw, βw]′ only not on any θi = [δ′
i, ci, αi, βi, κi, ζi,λ′i, ξ
′i]′ for all i and (2)
The density of ri,t conditional on It−1 and rw,t depends on [θ′w,θ
′i]′ and not on
any θj , j 6= i and the individual country specific shocks are independent across
emerging markets [assumption (b) in (11)].
4.3 Results
We structure our discussion of the results in three parts. First, we will ex-
amine the parameter estimates of the world factor model and the diagnostics.
Second, we will detail the implied level of integration, the time-varying correla-
tion with the world and the importance of world factors. Finally, we examine
some individual countries in greater detail.
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4.3.1 Parameter estimates and diagnostics
Table 3 presents some parameter estimates and residual diagnostics for the
world factor model. In some countries, the estimation was ill-behaved. Global
optima may not have been found in Nigeria, Portugal, Taiwan, Turkey, Venezuela
and Zimbabwe. No estimation was attempted for Indonesia since there are too
few observations.
Consider the factor ARCH restrictions. These models imply that κi = ζi and
that the world factor impacts volatility at a constant rate. The first restriction,
κi = ξi, is rejected in 14 of 19 countries at the 10% level of significance. The
second restriction, ψit = θit, is rejected in 17 of 19 countries. A joint test provides
evidence against the factor ARCH restrictions in all 19 countries. The implication
is that world factors affect volatility in a different manner through time. This is
exactly what our model is designed to capture.
The results of estimating the extended covariance model are presented are also
presented in Table 3. The restriction fi = ξi is examined with a likelihood ratio
test. The restriction is not rejected in Argentina, Brazil, Chile, Malaysia, Mexico,
and Turkey at the 10% level of significance. In two countries, Philippines and
Portugal, the estimation of the extended model failed. When all of the covariance
restrictions are simultaneously tested (fi = ξi as well as gi = ki = 0) there is
much more evidence against our model’s specification. Of the 11 countries where
it was possible to estimate this version of the extended model, the restrictions
were rejected for 7 (6) countries at the 10% (5%) level of significance.
Finally, the residual diagnostics are presented in the final columns of Table
3. These diagnostics test for serial correlation in the standardized disturbances of
the model for the mean and variance. These tests reveal little evidence against the
specification. The means test does not reveal a single rejection for the 19 countries.
The test on the variance disturbances shows evidence against the specification in
only Portugal.
It is possible that these residual diagnostic tests lack power. Importantly,
these results must be taken together with the tests of the extended covariance
15
specification which show evidence against the specification in many of the coun-
tries. Of course, our model is highly parameterized relative to the available data.
It is perhaps not surprising that the specification is rejected in many countries.
Nevertheless, it may be possible to learn something from a model which is statis-
tically rejected.
4.3.2 Correlation, integration and the importance of world factors
Table 4 details the proportion of variance due to world factors, the average
levels of market integration and the average conditional correlations from the
world factor model.
The mean proportion of variance due to world factors is provided over the
entire sample and for two subperiods. The first subperiod is the post October
1987 (post crash) period. The second subperiod is calculated after significant lib-
eralizations. This subperiod is country specific. 17 of the 19 countries experienced
capital market liberalizations (exceptions were Nigeria and Zimbabwe). This al-
lows us to examine the hypothesis that the importance of world factors increases
after capital market liberalizations.
The results suggest that only a small amount of variance is being driven by
world factors. In 16 of the 19 countries, the average proportion of variance being
driven by world factors is less than 10%. The countries that are most affected by
world factors are Malaysia, Portugal, Philippines, Greece, Mexico and Thailand.
In the subperiod beginning in November 1987, the degree of importance of
world factors increases for 12 of 17 countries (Indonesia not estimated and Turkey’s
data begins after November 1987). This period often coincides with capital market
liberalizations. In the post-liberalization period, the importance of world factors
increases in 10 of 16 countries (no liberalizations in Nigeria and Zimbabwe). Some
increases are particularly dramatic. For example, the importance of world factors
triples in Thailand after their liberalization. In Greece, the influence of world
factors doubles after their capital market liberalization.
16
The changing importance of world factors is mirrored in the time-variation
in conditional correlations with the world market portfolio. In 12 of 17 countries,
correlations increase after capital market liberalizations. Again, there are a num-
ber of dramatic examples. In the full sample, the average conditional correlation
of Thailand and the world market is 15.5%. In the post-liberalization period the
correlation increases to 37.9%. Similarly, in the full sample, the correlation be-
tween the Mexican equity return and the world market return is 19.8%. In the
subsample since capital market liberalization, the correlation is 41.5%.
Table 4 also presents the average level of mean and variance integration. The
discussion on these parameters will be focussed on the three countries we examine
in detail. Note that the interpretation of these numbers as “degree of integration”
may be strong. They reflect the relative time-varying importance of global versus
local factors in the mean and variance.
4.3.3 Further analysis for specific countries
While space does not permit a detailed examination of every country, we
highlight in this section three important emerging equity markets: Korea, Mexico
and Thailand.
4.3.3.1 Korea
Korea is the second largest of the “emerging” equity markets with market
capitalization of $107.4 billion at the end of 1992. Liquidity is very good with
average daily trading volume of $480 million. Indeed, the capitalization of the
equity market represents almost 50% of GDP. While this information suggests a
well functioning integrated capital market, there have been a number of regulatory
hurdles to foreign participation in Korean equity markets. Given these restrictions,
one might assume that the Korean equity markets are not integrated with world
capital markets.
17
The foreign ownership rules were relaxed in January 1992 (just as our sample
ends). Even with these “relaxed” regulations, foreign ownership is limited to only
10% of the market capitalization in so-called “unlimited industries,” and 8% in
the “limited industries” which include utilities, defense, shipping, transportation,
finance and communications. The 10% limit was almost immediately raised to
25% for the companies that already had more than 10% foreign ownership. In
addition, no single investor can own more than 3% of any Korean firm. Foreign
investors must apply for an ID number from a Korean broker on the Korean Stock
Exchange and all shares must be held in the owner’s name. This liberalization
still presents significant barriers to entry.9
Nevertheless, there are alternative ways to access Korean capital markets.
At the end of 1992, there were 34 Korea funds trading either privately or listed
on the New York Stock Exchange, London Stock Exchange, Hong Kong Stock
Exchange. The ability to access Korean investments in this way could account
for the estimated integration parameters presented in Figure 1a. The estimates
support the idea that the Korean equity market is integrated into world capital
markets and are consistent with the analysis presented in Bekaert and Harvey
(1995).
Although the Korean market appears integrated, very little variation in the
volatility is accounted for by world factors. Figure 1b indicates that less than
10% of the variation is due to world factors in the base model and there has been
little change through time. The small role of world factors is mimicked in the
conditional correlations presented in Figure 1c. The influence of world factors is a
function of the correlation, the degree of integration and the volatility ratio. Given
that the first three elements are fairly constant through time, it is of little surprise
that the ratio of world volatility to local volatility is fairly constant through time.
This is evident in Figure 1d.
9 Bekaert (1995) provides a catalogue of barriers to entry. Also see Bae (1993).
18
4.3.3.2 Mexico
Mexico is one of the largest emerging markets with a capitalization of US$139
billion, high trading volume of US$171 million daily and high GDP per capita
of US$2500. Most probably consider Mexico a reasonably “integrated” capital
market. This opinion is perhaps influenced by its proximity to the U.S. or the
large number of ADRs (36 in June 1992) and closed end funds (6 funds with
capitalization of US$16 billion). However, this prior belief is influenced by the
recent capital flows to Mexico.
Figure 2a presents the time-series of the measures of integration for the mean,
θi,t−1, and for the variance, ψi,t−1. Both integration measures trend upwards until
1982 and then begin to decline. This coincides with the debt crisis which began
in 1982.
The implied degree of integration sharply increases after 1988. This is es-
pecially evident for the measure of integration associated with the conditional
variance.10 This roughly coincides with significant capital market liberalizations.
For example, after 1989, 100% foreign investment in most firms is possible. Key
sector firms are restricted to 49% foreign participation and the foreign investment
limit in the banking industry is 30%.
The effect of the capital market liberalization is particularly evident in the
world factor proportions and the conditional correlations presented in Figures 2b
and 2c. These measures sharply increase after 1988.
The influence of world factors is accounted for by the degree of integration,
the conditional correlation and the volatility ratio. Figure 2d suggests that the
volatility ratio does not contribute to the increased importance of world factors.
While variable through time, it exhibits no particular trend.
10 There are a number of similarities and differences between the fitted integra-tion series and the one presented in Bekaert and Harvey (1995). The series inFigure 2a and the one in Bekaert and Harvey (1995) both drop sharply in 1982.However, there is no clear pattern in the integration measure (which is restrictedto the mean) after 1982. In contrast, the measure based on the variance in Figure2a sharply increases after 1988.
19
4.3.3.3 Thailand
Figure 3a presents the time-series of market integration measures from the
standard model for Thailand. The measures of integration for the mean, θi,t−1,
and for the variance, ψi,t−1, are presented. The average levels of these measures
increase during 1987. This follows a number of liberalizations in the Thai market
which culminate in December 1988. In particular, Bailey and Jagatini (1994)
detail the opening of the Alien Board for extranational trading of Thai securities
at this time. The measure for the mean is far more variable than the measure
for the variance.11 The extended model results for Thailand are similar to the
constrained, standard model. While not shown, the time-series patterns in both
integration measures appear similar to the standard model.
The influence of world factors is detailed in Figure 3b. Before 1987, little to
none of the variance in the Thai returns can be accounted for by world factors.
This is also evident in the overall mean of 0.04 reported in Table 3. However,
there is a sharp increase after 1987. In recent years, world factors account for
closer to 20% of the variation in the local variance.
Figure 3c details the time-varying conditional correlations with the world
market return. There is a sharp increase in the conditional correlations in 1987.
However, this increase is not entirely due to the stock market crash in October.
The correlations begin to increase in January 1987. In addition, the increase in
conditional correlation in 1987 and 1988 does not appear to be transitory. The
correlations level off to about 40% in the last three years of the sample. This is
comparable to the average level of correlation that Harvey (1991) details for 17
developed market returns.
The influence of world factors can be decomposed into three pieces. We have
detailed the first two: the degree of integration and the conditional correlation
with the world. The final piece is the ratio of volatility: world to local. Figure
11 In Bekaert and Harvey (1995), a similar pattern in the integration parame-ter was detected based on the mean. Nevertheless, the evidence in Figure 3a ismuch more consistent with capital market liberalizations having some bite afterDecember 1988.
20
3d shows the time-series patterns in this ratio. Since 1984, the ratio has been
decreasing (Thai volatility higher relative to world volatility).
5. The cross-section of volatility in emerging markets
5.1 Explaining volatility across emerging markets
One important difference between developed and emerging capital markets, is the
dispersion of volatility across countries. Harvey (1993) shows that the range of
unconditional volatilities in developed markets is 18% (from high to low). In
emerging markets, the range is 86% (18% for Jordan and 104% for Argentina).
We explore four sources of volatility differences: asset concentration, stock market
development/economic integration, microstructure effects, and finally macroeco-
nomic influences and political risk.
The most obvious source is the degree of diversification and concentration
inherent in the IFC index for each country. Schwert (1989a), Harvey (1991) and
Roll (1992) explore whether the number of stocks included in the index influences
the cross-section of volatility. We construct a time-series of the number of stocks
included in each of the IFC country indices. Following previous research, we
use the natural logarithm of the number of stocks as a proxy for the degree of
diversification.
The number of stocks in the index may not be that revealing of diversification
if there are few dominant stocks and many small stocks. Roll (1992) and Harvey
(1995c) examine asset concentration ratios:
CRi,t =
√√√√ Ni,t
Ni,t − 1
Ni,t∑
j=1
(wij,t −1Ni,t
)2 (21)
where Ni,t are the number of individual securities in the country i index in month
t and wij,t is the share of market capitalization represented by stock j at time t.
If one stock dominates the index, then CR gets close to one. If every stock has
equal market capitalization, then CR = 0. Using the EMDB’s individual stock
data, we create time-series of concentration ratios for each country.
21
A country index may have many stocks and a low concentration ratio but
may still not be diversified if all of the stocks are involved in a single industry.
Divecha, Drach and Stefan (1992) construct industry concentration ratios for a
single year using all available securities in 20 emerging markets. Harvey (1995c)
finds that these industry concentration data have only limited ability to explain
unconditional variance differences over the past five years. Given that a time-
series of industry classifications is not available, we are unable to examine the
effect of industrial concentration on the cross-section of volatility.
The second source is linked to both the development of stock market and
the degree of market integration. Unfortunately, exact measures of stock mar-
ket development and economic integration are difficult to specify. We consider
several proxies. First, we compute the cross-sectional volatility of the country’s
component stock returns at each point in time. As an economy becomes more
developed, it often becomes more diverse. If this diversity is reflected in the firms
whose equity is part of the IFC indices, then we would expect the cross-sectional
volatility of the country’s component stocks returns to increase. That is, as stocks
are less dependent on one sector, their covariances should decrease which should
increase the cross-sectional variance. At the level of the index, this effect should
decrease market volatility. Hence, our first measures of stock market development
are the cross-sectional standard deviation of each index’s component stock returns
and the cross-sectional mean absolute deviation. These are measured each month
relative to the average stock return in each country index. This interpretation of
the cross-sectional standard deviation will not necessarily hold in more developed
markets.
We also consider a number of additional proxies for stock market development
and economic integration. Bekaert and Harvey (1995) propose a model where
market integration is parameterized. They find that equity capitalization to GDP
is a useful instrument in characterizing the time-series of market integration. Stock
market capitalization to GDP is also often used as a stock market development
indicator [see Demirguc-Kunt and Levine (1993)]. We also track the size of the
trade sector by forming the ratio of exports plus imports to GDP.
22
The third source of volatility arises from market microstructure research. It is
well known that the heterogeneity of traders’ information sets as well as liquidity
affects the variance of returns. We proxy for these effects by examining the roles
of the number of stocks traded in any month and turnover ratios in explaining
the cross-section of volatility. In more developed markets, large changes in prices
across securities suggest that more private information is being revealed to the
market. In the model of Ross (1989), the volatility of prices is directly linked to
the rate of information flow in the market. Hence, increases in the cross-sectional
volatility could raise the variance of the distribution of future prices.
The fourth category focusses on macroeconomic volatility which Schwert
(1989a,b) shows is one of the underlying forces affecting stock market volatil-
ity. Unfortunately, the macroeconomic data are sparse or nonexistent in some of
the emerging markets. For instance, inflation variability is an obvious candidate
for an explanatory variable. However, the data are quite difficult to obtain and,
even if we used the published data, they are highly suspect in a number of coun-
tries. Since purchasing power parity is not rejected in high inflation countries [see
Liew (1995)], we use the variability of foreign exchange rate changes to proxy for
inflation variability.
Finally, political risk is also a likely candidate to influence the cross-section of
volatility. A time-series of political risk ratings is difficult to obtain.12 We chose to
focus on Institutional Investor’s Country Credit Ratings. These ratings are based
on a semi-annual survey of bankers. Institutional Investor has published this sur-
vey in its March and September issues every year since 1979. The survey represents
the responses of 75–100 bankers. Respondents rank each country on a scale of 0
to 100, with 100 representing the smallest risk of default. Institutional Investor
weights these responses by its perception of each bank’s level of global prominence
and credit analysis sophistication [see Erb, Harvey and Viskanta (1994, 1995)].
Credit ratings are not meant to solely represent a measure of political risk.
12 One of the best known rating services, Business International’s Country As-sessment Service, began ratings in 1971. It was sold in 1986 to The Economist.While the recent data from the Economist’s Intelligence Unit are available, thehistorical data has not been recompiled.
23
Many macroeconomic, as well as political factors, enter the bankers’ decisions on
the credit worthiness of a particular country. This variable captures both political
risk and macroeconomic stability. It is the only variable that we examine that
is ex ante (in the sense that participants are asked to assess the future credit
worthiness).
5.2 Methodology
The raw material for the cross-sectional analysis are the time-series estimates of
conditional volatility. We estimate a pooled time-series cross-sectional regression:
`n(σ2i ) = αi + β′Xi + ui i = 1, . . . ,N. (22)
There are N countries. σ2i is a Ti × 1 vector of preestimated conditional vari-
ances where Ti is the number of observations for country i, Xi is a matrix of L
explanatory variables for country i, αi are a set of intercept coefficients (one for
each country), and β is a L×1 coefficient vector. We use the conditional variance
estimates from the univariate, segmented volatility model. To check robustness,
we also report results using the world factor specification.
This model allows for fixed effects in the cross-section by not imposing that
the intercepts are identical across different countries. However, we also examine a
specification in which the intercepts are constrained to be constant across coun-
tries. This allows us to test how much of the variation in volatility is explained
by the specified variables. Our approach allows us to examine all observations for
all countries simultaneously.
Our initial estimation technique is ordinary least squares using the stan-
dard White (1980) correction for conditional heteroskedasticity. A standard La-
grange multiplier test reveals substantial evidence against homoskedasticity across
countries.13 Hence, we also present a generalized least squares estimation which
13 We adjusted the standard test discussed in Greene (1993) for the unequalnumber of observations present in our analysis.
24
allows for heteroskedasticity across countries (“group-wise heteroskedasticity”).
Finally, we present estimates which correct for both group-wise heteroskedasticity
and serial correlation. The serial correlation correction, which is detailed in Greene
(1993), is specific to each country and is based on the Prais-Winsten method. This
correction is particularly important given the extreme serial correlation in some
of the countries’ fitted volatility estimates.
Our formulation forces the coefficients to be identical through time. One way
to avoid this assumption is to estimate the model month by month. However,
between 1976 and 1981 we only have nine countries in the cross-section. As a
result, we do not have the degrees of freedom to feasibly estimate at each month.
5.3 Results
5.3.1 Summary analysis
The fitted volatility series cover (at most) 1977:01 to 1992:12. There are a total of
2627 fitted variances. However, the country credit ratings only begin in 1979:03.
As a result, for nine countries 32 observations are lost, reducing the total number
of observations to 2339.
Some summary statistics on the variables used in the cross-sectional regres-
sions are included in Table 5. The average values of the cross-sectional standard
deviation, number of firms in each index, asset concentration factor, country credit
rating, trade to GDP and market capitalization to GDP are presented in this ta-
ble. Correlation of the average volatilities and these variables are presented in
Table 6.
While the correlations are only based on 20 observations, there is much to be
learned. There appears to be a positive relation between the cross-sectional stan-
dard deviation and the volatility. The largest cross-sectional standard deviation
is found in Argentina (which also has the largest volatility).
There appears to be a weak negative relation between country credit ratings
and volatility. Lower quality ratings are generally associated with higher volatility.
25
However, one observation, Taiwan, is very influential. Taiwan has the highest
credit rating and also the fourth highest volatility.
The correlation matrix suggests that there is a weak positive relation between
the average number of companies in the index and volatility. This implies that a
larger number of companies in the index increases volatility. However, the relation
is not significant.
The analysis of concentration factors is difficult to interpret. The correlation
analysis reveals a negative relation between concentration and volatility. However,
the analysis is highly influenced by Jordan, which has the highest concentration
factor and the lowest volatility. Without Jordan, there appears to be a positive
relation (more big firms implies higher volatility).
There is a distinct negative relation between exports plus imports divided by
GDP and volatility. This suggests that the more open the economy is to trading,
the lower the volatility. The correlation between these variables is -38%.
There is also a negative relation between market capitalization to GDP and
volatility. This relation is weakened by two influential observations: Malaysia and
Taiwan. Both of these countries have very high capitalizations to national output
ratios and high volatility.
5.3.2 Time-series cross-sectional analysis
The time-series cross-sectional regression results are presented in Table 7. Panel
A considers the estimation with the standard White (1980) correction for het-
eroskedasticity. The results which correct for group-wise heteroskedasticity are
presented in Panel B and the estimation which corrects for both group-wise het-
eroskedasticity and serial correlation is in Panel C. In the base case with no
country-specific intercepts, 34% of the cross-section of volatility is explained with
the eight variables. Separate regressions are run with the cross-sectional standard
deviation of the individual index stocks and the cross-sectional mean absolute
deviation because these measures are 99% correlated. When the country specific
26
intercepts are included, the explanatory power of the regressions increases to 60%.
The way the cross-sectional standard deviation enters the regression depends
on the level of market development. As such, we allow this variable to en-
ter the regression as an interaction variable associated with the deviation from
the cross-sectional mean market capitalization to GDP ratio. If MCit/GDPt <
(MCt/GDPt) which is, for example, always true for Zimbabwe, Brazil, Pakistan,
then an increased cross-sectional standard deviation negatively affects the market
volatility. If MCit/GDPt > (MCt/GDPt), then the derivative of volatility with
respect to the cross-sectional standard deviation is positive which is what is pre-
dicted by the information flow model of Ross (1989). The results provide some
support for this specification. Both the cross-sectional standard deviation and
the interaction term enter the regression with coefficients more than 1.6 standard
errors from zero in Panels A and B. The coefficients are positive for the regression
with standard deviations in panel C but not significantly different from zero.
The number of companies in the index has a negative coefficient that is about
two standard errors from zero in the base estimation. This implies that a larger
number of companies decreases volatility. This is exactly what one would expect.
However, in Panels B and C, this variable fails to play a significant role.
The evidence on the concentration factor is somewhat puzzling. This factor
is weakly negatively related to volatility. That is, a country with a few highly
concentrated firms is likely to have lower volatility. This variable is highly signif-
icant in all the regressions with fixed effects in panels A and B. In panel C, the
coefficient is less than two standard errors from zero in the fixed effects regression.
We investigated the influence of Jordan by adding a slope dummy variable for this
country. There was still a negative effect. The results suggest that markets with
a few very large stocks have lower volatility.
The relation between turnover and volatility is difficult to interpret. There
are two countries, Taiwan and Korea, with turnover ratios an order of magnitude
greater than the other countries. Using 18 countries, there is weak negative re-
lation between turnover and volatility when measured by averages. However, in
the time-series cross-sectional regression, turnover is positively related to volatil-
27
ity. Since the turnover data begin in 1986, a separate regression is estimated with
turnover included and the coefficients are reported in the far right column of panel
A of Table 7.
In many of the regressions, the country credit rating enters with a negative
coefficient. This implies that a lower credit rating is associated with higher volatil-
ity. This variable is often significant in panels A and B and less significant in panel
C.
There is also a very significant negative relation between the size of the trade
sector and volatility. In the regression without country specific dummy variables,
the trade sector is often more than 5 standard errors from zero irrespective of
the standard error correction. A more open economy is associated with lower
volatility.
The market capitalization to GDP ratio enters the regression with a positive
sign in panels A and B. This is unexpected given the correlation analysis suggested
a negative relation (larger equity market implies lower volatility). However, this
variable is highly correlated with the trade variable (70%). When the regression
is run without the trade variable, the market capitalization ratio enters with a
less significant coefficient. In addition, in the estimation which corrects for serial
correlation and heteroskedasticity, this variable enters with a positive coefficient
which is more than two standard errors from zero.
Finally, the volatility of foreign exchange rate changes plays a very important
role in explaining equity return volatility. In the regression without fixed effects
the coefficient on this variable is 15 standard errors from zero. When country
dummy variables are allowed, the coefficient is six standard errors from zero. The
significance of this variable may be not that surprising given that we are measuring
equity returns in U.S. dollars although it may also capture inflation variability.
In addition, an extensive sensitivity analysis is conducted. In the univariate
models where the αi + βi constraint was binding, we reestimated removing the
constraint. When these fitted values were used in the time-series cross-sectional
analysis, there was little difference in the results.
In another exercise, we used the fitted variances from the world factor estima-
28
tion (except for Indonesia) in the time-series cross-sectional analysis. The results
are broadly consistent with those reported in Table 7. In panel D, we report two
of the estimations using the world factor variances. This estimation corrects for
the group-wise heteroskedasticity and serial correlation. Although most results
are robust, there are a few differences. The cross-sectional standard deviation
variable now enters with a positive sign and the interaction term with MCGDP
also obtains a positive and much larger coefficient. Although the coefficients are
not statistically significant, the effects are as expected: for countries with large
market capitalizations, increases in the cross-sectional standard deviation reduce
volatility.
Overall, the sensitivity analysis and the results in Table 7 suggest that the
prespecified variables capture an important part of both the cross-section and
time-series of volatility.
5.4 Capital market liberalization and volatility
Figure 4 informally characterizes the effect of capital market reforms on vari-
ance. The average conditional variance two years after the reform is depicted on
the y-axis and the average conditional variance two years before the reform is pre-
sented on the x-axis. On average, if there is no effect on volatility the variances
should fall around the 45o line. If variance decreases, then many of the points
should fall below this line.
The major liberalization dates are from Bekaert (1995) and are contained in
Table 8. The evidence in Figure 4 suggests that volatility decreases after liberal-
izations. Of the 17 countries, where there was a liberalization within our sample,
only 4 show evidence of increased volatility (Pakistan, Colombia, Venezuela and
Turkey). In most countries, volatility decreases. Particularly dramatic decreases
are found for Taiwan, Mexico, Portugal, Argentina and Brazil. The evidence for
Brazil is consistent with the empirical findings in Bekaert, Garcia and Harvey
(1995b).
29
A weakness of this analysis is that other events could occur that decrease
or increase volatility that have little to do with capital market liberalizations.
Therefore, we introduce liberalization dummy variables into our cross-sectional
analysis and test whether, after controlling for these factors, these interventions
significantly decrease volatility.
The results are contained in panels A through D of Table 7. We introduce
four dummy variables to break each of the 17 countries’ volatility into four pieces:
early (more than 30 months before liberalization), pre (30 to six months prior to
liberalization), during (six months prior to three months after liberalization) and
post (four months after liberalization to end of sample.) The logic here is that
when liberalizations are pre-announced or anticipated by market participants,
volatility may change some time before the liberalization date.
Consider Panel A of Table 7. The pre, during and post indicators enter
with coefficients that are significantly different from zero. In both the regressions
that use standard deviations and mean absolute deviations, the coefficient on the
post-liberalization indicator is lower than the coefficient on the pre-liberalization
indicator. For example, in the regression that uses mean absolute deviation, the
post-liberalization coefficient is 0.279 and the pre-liberalization coefficient is 0.345.
We also conducted a heteroskedasticity consistent Wald test of the the hypothesis
that the coefficient on the pre and post-liberalization dummy variables were the
same. The null hypothesis is not rejected with a p-value of 0.229.
The evidence of a volatility change after liberalization in much sharper in the
estimations which use generalized least squares. For example in the regression
which corrects for group-wise heteroskedasticity and uses standard deviation, the
coefficient on the pre-liberalization indicator is 0.130 and the coefficient on the
post-liberalization in -0.037. The heteroskedasticity consistent Wald test provides
a rejection of the null hypothesis at the 0.001 level of significance. Similarly, in
the regressions which correct for both group-wise heteroskedasticity and serial
correlation, the Wald test provides evidence against the null hypothesis at the
0.007 level of significance.
To check robustness, panel D reports the results using the conditional vari-
30
ances of the world factor model with the correction for group-wise heteroskedas-
ticity and serial correlation. In both specifications, the post liberalization volatil-
ity is slightly but not statistically significantly lower than the pre liberalization
volatility.
5.5 Economic significance of the results
In the preceding discussion, we have analyzed the statistical significance of
various influences on volatility in emerging markets. In this section, we explore
which factors are economically significant. To do so, we conduct the following
experiment. Consider a relatively closed country with a not very well developed
stock market. Such a country is likely to be characterized by high stock market
volatility, a low cross-sectional standard deviation, a high concentration ratio, and
low market capitalization to GDP. There may be political risk reflected in a low
credit rating and unstable macroeconomic policies translating into high foreign
exchange volatility. To make this more concrete, we interpret high (low) as the
75% (25%) quartile in the cross-sectional distribution of the relevant variables
using all the observations for all the countries over the full sample.
Panel A of Table 9 reports the relevant data characteristics for this hypo-
thetical country (the 25th percentile). Suppose this country opens up its capital
markets and becomes a “median” country, in terms of concentration ratios, open-
ness, political risk and the other factors. We use the cross sectional regressions
to predict what would happen to its (annualized) equity volatility. This exercise
also allows us to assess the impact of the different estimation techniques on the
model predictions.
Panel B of Table 9 details the partial effects of each of the variables. The cross-
sectional standard deviation or mean absolute deviation, the concentration ratios
and the market capitalization to GDP have relatively minor and/or inconsistent
effects. The number of companies in each index has a negative contribution (more
firms less volatility) in the OLS model and the world factor model. The credit
31
rating variable has a negative contribution (higher rating lower volatility) in the
world factor model. The trade sector to GDP, foreign exchange volatility and
liberalization indicators have consistent important contributions. When the effects
are cumulated, the implication for volatility is remarkably consistent across the
estimation methods. With the univariate variance estimation, the cumulative
effect on volatility ranges from -6.0% to -7.2%. Using the world factor variances,
the cumulative effect on volatility ranges from -6.0% to -6.6%. In other words,
the move from the 25% percentile to the median for the hypothetical emerging
market, reduces volatility by at least 6.0%.
6. Conclusions
Our research has a number of goals. First, we are interested in characterizing
volatility in emerging markets. Volatility is an important input for asset allocation
decisions. In segmented capital markets, country volatility is a critical input in
the cost of capital calculation. However, volatility is difficult to model in these
markets. We present a number of volatility models, allow for very general error
distributions, and provide a battery of diagnostic tests.
Second, we are interested in the forces that affect the time-series of volatility
in these emerging equity markets. In fully integrated markets, we believe that
volatility is strongly influenced by world factors. In segmented capital markets,
volatility is more likely influenced by local factors. Our decomposition of the
sources of variation in volatility helps shed light on the degree of integration of
each market with world capital markets and on how the degree of integration
varies over time.
Third, we explore the forces that determine why volatility is different in the
various emerging markets. We construct a number of variables: number of firms
in the country index, asset concentration factors, country credit ratings, cross-
sectional standard deviation of the individual stock returns within the indexes,
size of the trade sectors to GDP, and market capitalization to GDP ratios. Among
other interesting findings, we show that more open economies (in terms of world
32
trade) have significantly lower volatilities. We also find that political risk as
proxied by credit quality explains a large amount of the cross-sectional variation
in volatility.
Finally, we study the effect of capital market liberalizations on volatility.
Given our time-series models, we investigate whether volatility decreases after
liberalizations. Our evidence suggests that volatility either remains the same or
decreases in 13 of 17 countries. There is a sharp drop in volatility in five countries
in our sample. Even after controlling for all the potential influences on the time-
series and cross-section of volatility, we find that capital market liberalizations
significantly decrease volatility in emerging markets.
33
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36
Appendix: Estimation and testing of univariate, segmented models
A.1 Specification tests
We present the standard battery of specification tests. However, we are most
interested in distinguishing the model’s overall performance. To this end, we
propose the following test which is inspired by the presentation in Nelson (1991).
Consider the standardized residuals, zt = εt/σt. Under the null hypothesis that
the model is correctly specified:
(a) E[zt] = 0
(b) E[z2t − 1] = 0
(c) E[ztzt−j ] = 0 j = 1, . . . , k
(d) E[z3t − sk] = 0
(e) E[z4t − ku] = 0
(f) E[(z2t − 1)(z2
t−j − 1)] = 0 j = 1, . . . , k
(A1)
where sk represents the skewness parameter and ku is the kurtosis. The correct
specification of the conditional mean is implicit in (A1c). The conditional variance
is in (A1f). In (A1a,b,d,e), the unconditional moments of z are compared to the
ones predicted by the model.
In the standard setup, model I, sk = 0 and ku = 3. For model II, the skewness
is also equal to zero, sk = 0, but the kurtosis is ku = 3(ν − 2)/(ν − 4). For the
SPARCH model, the skewness is:
sk = p(µ31 + 3σ2
1µ1) + (1 − p)(µ32 + 3σ2
2 µ2),
and the kurtosis:
ku = p(6µ21σ
21 + 3σ4
1 + µ41) + (1 − p)(6µ2
2σ22 + 3σ4
2 + µ42).
Notice that the SPARCH model collapses to model I (ku = 3, sk = 0), when
p = 1, µ1 = 0 and σ1 = 1.
37
Much like our normality tests, it is straightforward to use generalized method
of moments to conduct specification tests.14 The conditional mean specification is
tested by setting k = 6 and obtaining a χ2 statistic from (A1c). A similar test is
conducted on the conditional variance in (A1f). The distributional assumptions of
the model are tested by examining (A1a,b,d,e). This results in a χ2 statistic with
four degrees of freedom. It is also possible to jointly test all of the restrictions.
With k = 6, there are 16 degrees of freedom in the test statistic.
A.2 Baseline estimation
Table A1 presents the parameter estimates for the three models: normal, t-
distribution and SPARCH and Table A2 presents detailed diagnostics of the three
specifications. Given the results in Table 1, which shows very high unconditional
variance and sharp departures from normality, it is no surprise that these are
extremely difficult variance processes to fit.
In Table A4, we conduct diagnostics on both model residuals and scaled resid-
uals. In the first panel, we analyze the residuals. The Cumby-Huizinga (1992)
`-statistic is a test for serial correlation that is robust to heteroskedasticity and
corrects for the fact that the residuals are estimated. However, the test is only
strictly valid when the model is estimated using ordinary least squares or in-
strumental variables techniques. The Q2-test is the standard Box-Pierce test for
heteroskedasticity and tests for persistence in the squared residuals. Finally, we
report skewness and kurtosis of the residuals. In the second panel, we scale the
residuals by dividing them by the conditional standard deviation. The specifica-
tion tests detailed in section 3.2 are detailed in these panels.
Consider the analysis of the three models’ residuals reported in panel A of
Table A3. First, the residuals of all three models for most of the countries are
autocorrelated. The Cumby-Huizinga test shows significant serial correlation in
14 However, in contrast to the normality tests, the specification tests will bebased on moments from generated time series.
38
the residuals for 13 of 20 countries when the normal model is estimated; 10 of
19 for the SPARCH model (estimation failed to converge for Chile); and 14 of 20
countries for the model based on the t-distribution. This serial correlation occurs
despite the fact that the lagged returns appear in the conditional mean specifica-
tion. Indeed, the lagged return enters the specification more than one standard
error from zero in 13 of the 20 countries for the normal model (parameter δ2).
The residual serial correlation suggests that the specification of the conditional
mean could be incorrect.
The analysis of squared residuals suggests that there is significant het-
eroskedasticity in the data. This test, however, only measures the multiple correla-
tion of past squared residuals. Significant autoregressive conditional heteroskedas-
ticity is found in about half of the countries examined. There is little variation
across the different models.
Finally, the distributional characteristics of the residuals are examined. With
only a few exceptions, the distributional features of the residuals are similar across
the different models. The analysis indicates that the residuals depart from nor-
mality. For example, after estimating the model based on the normal distribution,
significant skewness is detected in 8 of 20 countries and kurtosis departs from the
value implied by a normal distribution in 9 countries. The significant kurtosis
in the residuals suggests that a model based on the t-distribution may be more
appropriate. The residual skewness motivates going to the SPARCH model which
allows for fairly general skewness and kurtosis.
Now consider the parameter estimates and the diagnostics based on stan-
dardized residuals. The first model presented is based on the normal distribution.
Given the evidence on the distribution of the returns and residuals, this model is
the most likely to be rejected. The diagnostic results show that 7 of the 20 coun-
tries show significant covariance of current and past standardized residuals (mean
test) and 9 countries have predictable squared standardized residuals (variance
test). When we test the null hypothesis that residuals have a zero mean, unit
standardized variance, zero skewness and kurtosis equal to three, the null is re-
jected at the 5% level for 14 of the 20 countries. When all of the standardized
39
residual tests are combined, the joint test reveals a rejection of the specification
for all 20 countries.
As mentioned above, the model based on the t-distribution attempts to ac-
commodate some of the kurtosis found in the residuals. One extra parameter, the
degrees of freedom in the student t-distribution, ν, is estimated. For the fourth
moment to be well defined, this parameter must be greater than four. However,
the estimation presented in Table A1 reveals that in six countries (Argentina,
Colombia, Greece, Nigeria, Pakistan, and Turkey), the degrees of freedom param-
eter is less than four.
The analysis of the standardized residuals in the second panel of Table A2
shows that the null hypothesis of no predictability of the standardized residuals is
rejected in 4 of the 14 countries where the model presented a degrees of freedom
parameter greater than four. The squared standardized residuals are predictable
in 7 of 14 countries. The moment test presents rejections for 10 of 14 countries.
The joint test suggests that the restrictions implied by the null hypothesis (stan-
dardized residuals follow a t distribution) are rejected for all countries.
The SPARCH model which allows for general nonnormalities fares slightly
better than the two fully parametric models. Underlying the SPARCH is a mix-
ture of normal distributions. As a result, three additional parameters are esti-
mated: the mean and variance of the second normal distribution and the mixing
parameter. In some of the countries (Colombia, Malaysia, Mexico, and Pakistan),
the mixing parameter is greater than 0.96. The model did not converge for Chile
and Portugal. In addition, Nigeria’s results are suspicious.
The null hypothesis of no predictability of the standardized residuals is re-
jected in only 6 of the 20 countries compared to 7 of 20 for the normal model.
The squared standardized residuals are predictable in 12 of 20 countries (9 of 20
for the normal model). The test that the standardized residuals’ moments match
the theoretical moments implied by mixture of distributions is rejected in 14 of
20 countries (compared to 14 of 20 for the normal model and 10 of 14 for the t-
distribution). Similar to the other models, the joint test reveals evidence against
the null hypothesis for almost all the countries’ specifications.
40
Figure A1 presents the fitted variances for the three models for each of the
countries. The thin solid line represents the GARCH model with the normal
distribution. The thin dotted line is the model with the t-distribution The thick
dotted line represents the conditional variances from the SPARCH model. The
fitted values show where each of the models fail. The normal model produces
unreasonably smooth fitted values in the Philippines and Turkey. The model based
on the t-distribution produces too smooth variances for Chile and the Philippines.
The SPARCH model fails for Chile, Indonesia and Nigeria.
Overall, the GARCH models have difficulty in fitting the highly volatile and
non-normal returns in the emerging equity markets. Even when non-normalities
are explicitly allowed for in the estimation (t-distribution and SPARCH), the
diagnostics reveal that the specifications are almost always rejected. We now
explore two different routes: building a multivariate framework to allow for cross-
country effects and incorporating asymmetries into the variance process. First,
we will explore the asymmetric GARCH specification.
A.3 Asymmetric GARCH estimation
Results for the asymmetric GARCH models are presented in Table A3. The
parameter γi allows for asymmetry. The test for asymmetry is whether this pa-
rameter is two standard errors from zero. In general, the sign and magnitude
of this parameter is not that sensitive to the distribution used in the GARCH
estimation. As such, we will concentrate our discussion on the normal model or
SPARCH model.
In 11 of 19 countries (no model converged for Turkey), the coefficient is neg-
ative indicating that volatility is lower in negative returns market. In 9 of these
11 countries, the parameter is significantly less than zero. In contrast, only 4
countries (Korea, Nigeria, Philippines, and Zimbabwe) show significantly positive
coefficients.
In general, the asymmetric GARCH provides an improvement in fit for most
41
of the countries in our sample. The fitted variances are presented in Figure A2.
However, it is surprising that in most of the countries, negative return innovations
appear to decrease variance. This is the opposite to what would be predicted based
on a leverage hypothesis.
42
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