Portfolio Flows, Global Risk Aversion and Asset Prices in Emerging Markets

Contributor Notes

Authors’ E-Mail Addresses: lzhang2@imf.org; nananchotikul@imf.org

In recent years, portfolio flows to emerging markets have become increasingly large and volatile. Using weekly portfolio fund flows data, the paper finds that their short-run dynamics are driven mostly by global “push” factors. To what extent do these cross-border flows and global risk aversion drive asset volatility in emerging markets? We use a Dynamic Conditional Correlation (DCC) Multivariate GARCH framework to estimate the impact of portfolio flows and the VIX index on three asset prices, namely equity returns, bond yields and exchange rates, in 17 emerging economies. The analysis shows that global risk aversion has a significant impact on the volatility of asset prices, while the magnitude of that impact correlates with country characteristics, including financial openness, the exchange rate regime, as well as macroeconomic fundamentals such as inflation and the current account balance. In line with earlier literature, portfolio flows to emerging markets are also found to affect the level of asset prices, as was the case in particular during the global financial crisis.

Abstract

In recent years, portfolio flows to emerging markets have become increasingly large and volatile. Using weekly portfolio fund flows data, the paper finds that their short-run dynamics are driven mostly by global “push” factors. To what extent do these cross-border flows and global risk aversion drive asset volatility in emerging markets? We use a Dynamic Conditional Correlation (DCC) Multivariate GARCH framework to estimate the impact of portfolio flows and the VIX index on three asset prices, namely equity returns, bond yields and exchange rates, in 17 emerging economies. The analysis shows that global risk aversion has a significant impact on the volatility of asset prices, while the magnitude of that impact correlates with country characteristics, including financial openness, the exchange rate regime, as well as macroeconomic fundamentals such as inflation and the current account balance. In line with earlier literature, portfolio flows to emerging markets are also found to affect the level of asset prices, as was the case in particular during the global financial crisis.

I. Introduction

Since the mid–2000s, capital flows to emerging markets (EMs) have become increasingly large and volatile2. After the boom-bust cycle in 2005–08, portfolio flows to EMs recuperated to unprecedented high levels (Figure 1), partly driven by extremely accommodative monetary policies in advanced economies. Net inflows turned into net outflows as global risk aversion spiked around the peak of the euro area crisis in 2011–12, before recovering in 2013. More recently, as market expectations of an exit from quantitative easing by the U.S. Federal Reserve firmed up and uncertainties about growth prospects in EMs increased, EMs experienced episodes of capital flow reversals, in particular during the May 2013 and January 2014 episodes. Going forward, there will likely be further bouts of capital flow volatility in EMs.

Figure 1.
Figure 1.

Cumulative Portfolio Flows to Emerging Markets and Financial Centers

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Source: EPFR database, IMF staff calculations.Note: The figure shows regional averages of cumulative weekly EPFR equity and bond flows since 2003 (equity) or 2004 (bond) through February 2014.

At the same time, asset prices in EMs have experienced large swings, in many instances coinciding with episodes of capital flow surges and reversals. Figure 2 shows asset price developments in three asset markets across regions. Despite some regional heterogeneity, there seems to be very strong co-movement of asset prices, especially in stock and bond markets. Concomitant with capital flow reversals at the onset of the global financial crisis (GFC), stock market indexes fell sharply across EMs and bond yields rose to historical highs. Both markets then recovered strongly, with some corrections coinciding with the events mentioned above. Exchange rates followed broadly similar patterns across regions, with Asian currencies displaying much less volatility through the cycles, likely reflecting the managed exchange rate regime in many economies.

Figure 2.
Figure 2.

Asset Prices in Emerging Markets

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

In the VAR analysis below, we find that global factors including the degree of global risk aversion and asset returns in advanced economies have been key drivers of capital flows to EMs, and particularly so at high frequency. This stresses the importance of capital flows as a transmission channel through which developments or shocks in global financial markets impact financial markets in other economies.

To what extent are capital flows and global risk aversion3 driving asset price volatility in EMs? There has been a large literature studying the effect of capital flows on asset prices.4 This paper complements the literature in two important ways. First, most of the existing literature examines the level impact of capital flows on asset prices, using analytical frameworks such as VAR or panel regressions. In this paper, the use of a Multi-variate GARCH model allows us to study not only the level impact, but also the (asset price) volatility impact of global risk aversion. In addition, previous studies typically focus on one particular asset price, while here studying the three asset prices together allows us to control for cross-asset market spillovers when estimating the impact of capital flows. Second, previous literature uses balance of payments data, which are only available at quarterly frequency for most emerging economies. In this paper, we use a dataset based on net equity and bond inflows to EMs for registered funds from Emerging Portfolio Fund Research (EPFR). Because it is available at a weekly frequency,5 it enables us to study the high-frequency impact of capital flows and global risk aversion. Our work is also related to the literature on microstructure theory that considers the effect of order flows (signed transaction) on asset market volatility on a daily basis. Although there the focus is on the effect of flows on conditional variance of asset prices, in this paper we emphasize the effect on volatility of global risk aversion, with the level of capital flows assumed to affect mainly the level of asset prices.

We find that global risk aversion (proxied by VIX) has a significant impact on the volatility of asset prices in EMs, while the magnitude of the impact varies with country characteristics. The impact of the VIX on stock market volatility is closely correlated with the financial openness of the country, as measured by total foreign liabilities in percent of GDP. The more exposed a country is to external fund flows, the greater the spillover from higher global risk aversion to the domestic equity market appears to be. No similar pattern is observed for bond markets. Instead it appears that the bond market’s sensitivity to the VIX correlates better with domestic macro-economic fundamentals such as inflation and the current account balance. The impact is also most pronounced at the longer end of the yield curve. Regarding exchange rates, the effect of the VIX unsurprisingly depends on the exchange rate regime, with more managed currencies showing much less sensitivity to global risk aversion. By contrast, the impact of the VIX on bond yield volatility seems to be amplified in these economies, possibly reflecting the inability of exchange rate to serve as a shock absorber.

Our analysis also shows significant effect of (EPFR) portfolio flows on asset price levels, especially during the GFC. The impact of foreign equity and bond flows on the three asset prices is typically small in “normal” times, but was amplified 5–10 times during the crisis. As a caveat, however, this finding might reflect omitted factors, such as domestic investors selling off at the same time as foreign investors during the crisis, or shrinking market liquidity leading to a larger price impact of a given capital outflow.

The paper is organized as follows. Section II presents stylized facts of EPFR data and the drivers of flows in terms of pull vs. push factors; Section III describes the methodology and data used in the Multivariate-GARCH analysis; Section IV presents the empirical findings on the impact of capital flows and global risk aversion on asset prices, and relates it to country characteristics; Section V concludes.

II. Stylized facts on EPFR portfolio flows

A. Data

To study high-frequency dynamics of international capital flows to EMs, we use a dataset on weekly portfolio flows provided by EPFR Global. Given that EPFR only covers mutual funds and Exchange Traded Funds (ETF), the flow data represents a subset of total portfolio flows as measured in the Balance of Payment statistics.6 However, despite the smaller coverage, fluctuations in EPFR flows are shown to match those in BOP data rather closely7 and have the advantage of being available at much higher frequency. Weekly frequency, as opposed to annual or quarterly frequency often used in previous literature, offers the valuable advantage of allowing us to better isolate specific shocks and crisis events on capital flows, and to better identify the effect of capital flows on asset prices. It also enables us to look more closely at the short-run dynamics of capital flows, which may differ from their long-run behavior.

In this paper, the fund-level data provided by the EPFR are aggregated at the level of each recipient country, for the 17 emerging markets and 2 financial centers in our sample. The sample period starts from the beginning of 2003 for equity flows, and mid-2004 for debt flows, through the end of February 2014. For cross-country comparability, z-scores of individual country’s weekly flows are calculated and used throughout the analysis.8

B. Stylized Facts

It is worth highlighting some key features and stylized facts of the EPFR portfolio flows before delving into the main analysis. Figure 3 plots the z-scores of weekly equity and bond flows in different regions, with the top panel covering the global financial crisis of 2008 and the bottom panel showing most recent developments over 2012–14. Several interesting stylized facts can be drawn from these figures:

Figure 3.
Figure 3.

Weekly Portfolio Flows to Emerging Markets during 2007–09

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Source: EPFR database, IMF staff calculations.
  • First, portfolio flows into different regional EMs are highly synchronized, especially following the global financial crisis (GFC).9 After a large retrenchment in late 2008 and early 2009 due to the GFC, equity flows to EMs across the three regions saw their first peak in 2011 and the second peak during the first half of 2013 before starting to decline until the end of our sample period. The pickup in bond flows was particularly strong in EM Europe and EM Latin America, but less so in EM Asia and the financial centers. The strong co-movement of capital flows to EMs across regions underscores the role of common factors in driving short-term dynamics of portfolio flows.

  • Second, extreme events are more frequent on equity flows than on bond flows. Extreme observations above two standard deviations are not atypical in the case of equity flows. But in the case of bond flows extreme events are much less frequently observed, with the exceptions of a few events, such as the Lehman crisis and the unexpected “Fed tapering” talk in May 2013.10

  • Third, high-frequency equity and bond flows respond to extreme events somewhat differently. For example, while equity flows to EMs declined sharply prior to the Bear Sterns event in mid-March 2008, bond flows appeared unscratched during that episode. In contrast, after the Lehman collapse, bond flows reversed sharply while equity flows remained relatively stable. In the May 2013 “QE tapering” event, however, investors retrenched from EM bond and equity markets to similar degrees. This underlines the importance of understanding both the common and differing forces behind the two types of portfolio investment flows.

C. Drivers of EPFR Flows—Pull vs. Push Factors

Recently, what drives cross-border capital flows has become a hotly debated topic in international policy forums. As policy makers in EMs stressed the role of ultra-easy monetary policies in advanced economies in “pushing” capital toward EMs, others have emphasized the growth and return attractiveness of EM economies as “pull” factors drawing capital from abroad.

This debate regarding “push” versus “pull” factors is not new; an earlier literature had focused on a surge of capital inflows to EMs in the late 1980s and early 1990s. Most recent literature has studied more specifically the behavior of capital flows around the GFC.11 The overall findings seem to suggest that both push and pull factors matter, but their relative importance varies across recipient countries, types of flows, and time.12 Fratzscher (2011), for instance, finds global factors to be the main drivers of capital flows during the crisis, while country-specific pull factors have been more important in explaining the dynamics of global flows after the crisis particularly for EMs.13

Most of the vast literature on push and pull factors has relied on low-frequency (quarter or annual) balance-of-payments data on capital flows. Thus far, little has been learned about what drives cross-border flows at a higher frequency, which yet is crucial for monitoring short-run developments of capital flows such as their sudden surges or reversals. To fill this gap in the literature, in this subsection we estimate country-by-country vector auto regressions (VARs) to analyze the dynamic interaction for each EM economy between weekly portfolio flows, macroeconomic fundamentals, and global financial factors.

We select a set of push and pull variables based on the existing literature. The push factors consist of (1) the VIX index as a measure of global risk sentiment, (2) S&P 500 excess returns to proxy for global stock performance and global growth prospects, and (3) the 10-year U.S. Treasury bond yield to reflect global interest rate conditions. The pull factors include (1) the GDP growth forecast for the recipient economy considered, (2) inflation, (3) the domestic short-term interest rate, and (4) the change in the domestic exchange rate vis-à-vis the U.S. dollar. The capital flow variables are the standardized weekly EPFR equity and bond flows to each recipient economy. We estimate the VARs separately for each type of flows and use the Cholesky decomposition for impulse response and variance decomposition calculations. Weekly EPFR flows are entered in the VAR in levels of their z-scores as standard unit root tests indicate stationarity.14 The order of the variables entering the VAR is as follows:15

{VIX,SP500,US10Yyield,Growth,Inflation,STrate,EPFRflows,FXreturn}

Figure 4 shows the variance decomposition implied by our VAR results for selected countries in our sample.16 The variance of each type of portfolio flows appears to be mostly due to own shocks—about 80 percent for equity flows and slightly higher for bond flows.17 This could reflect the importance of idiosyncratic factors at high frequency or other factors such as the fund manager decision-making behavior that are not captured in this model. For the rest of the variance, global factors, particularly the VIX and S&P 500 excess returns, are much more important contributors than domestic factors.18 Among the domestic factors, exchange rate returns of the recipient country are generally a more important driver of portfolio flows, especially bond flows. As shown in the figure, there is also some cross-country heterogeneity in terms of the contribution of each shock.19

Figure 4.
Figure 4.

Variance Decomposition of Weekly Fund Flows

(In percent of total variance)

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

More detailed historical decompositions reveal that the contributions from domestic pull factors to the historical deviation of portfolio flows from their trend are by and large more persistent than global factors. Figure 5 illustrates this stylized finding for the cases of Indonesia and Brazil as an example. The same pattern—persistent contributions from domestic factors versus volatile contributions from global factors—holds true for all other countries. This is intuitive given the more volatile nature of global financial variables in comparison with more stable domestic macroeconomic fundamentals. And precisely because of the more fickle nature of global financial variables, it is possible that when the relationships between capital flows and other variables are analyzed using data at quarterly or annual frequency, the contribution of global financial factors on capital flows becomes smaller as its weekly fluctuations cancel out. This makes the domestic pull factors appear more important in analyses over longer horizons. In Figure 6 simple averages (over a year) of historical contributions of global and local factors illustrates this point: the contribution of push and pull factors to portfolio flows now turning out to be more comparable. This historical decomposition also shows that relative importance of the push and pull factors varies over time, with the push factors being dominant drivers of flows to EMs during the crisis period, in line with Fratzscher (2012).20

Figure 5.
Figure 5.

Historical Decomposition of Weekly EFPR Flows in Selected Countries

(Contribution of each factor to total deviation of weekly flows from trend, in z-score unit)

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Figure 6.
Figure 6.

Historical Decomposition of Total Fund Flows Deviation Pull vs. Push Drivers

(annual average of weekly effects)

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

III. Methodology

To quantify the impact of portfolio flows and global risk aversion on asset prices, we estimate a country-specific Multivariate GARCH (MGARCH) model on stock returns, bond yields, and exchange rates. The advantage of using a MGARCH framework is two-fold: first, it is well-known that asset returns exhibit significant volatility clustering, that is, higher volatility tends to be followed by high volatility, making it important to allow for time-dependent volatility for the model to capture the dynamics of asset prices; second, the MGARCH model allows for relationships between the volatility processes of the three assets, capturing important cross-market spillover effects. In particular, the Dynamic Conditional Correlations (DCC) MGARCH allows these spillover effects to change over time, which is often the case with financial variables.21

To look at the high-frequency impact of portfolio flows, we use weekly data from 2004 to early 2014. The portfolio flow data are based on net equity and bond inflows to EMs for registered funds from EPFR. As a proxy for global risk aversion, we use the VIX index. The analysis covers 17 major emerging economies,22 including 6 Asian countries (China, India, Indonesia, Thailand, Malaysia, the Philippines), 5 Latin American economies (Brazil, Argentina, Mexico, Colombia, Chile), as well as 6 CEE/CIS countries (Bulgaria, Romania, Hungary, Poland, Russia, Turkey).

The general GARCH model is composed of the mean equation and the volatility equation.

yt=Cxt+εtεt=Ht1/2vt

where yt is an m × 1 vector of dependent variables; C is an m × k matrix of parameters, xt is a k × 1 vector of independent variables; Ht1/2 is the Cholesky factor of the time-varying conditional covariance matrix Ht and vt is an m × 1 vector of zero-mean, unit-variance, and independent and identically distributed innovations. In conditional correlation models, Ht is decomposed into a matrix of conditional correlations Rt and a diagonal matrix of conditional variances Dt

Ht=Dt1/2RtDt1/2

In our model, the mean equation captures the effect of capital flows and global risk aversion on the level of asset returns, specified as follows:23

(StBtEt)=(CsCbCe)+(βsαsβbαbβeαe)(EPFRtVIXt)+(εs,tεb,tεe,t)

where St stands for stock market returns, Bt represents changes in 10-year government bond yields, and Et is the change in the log exchange rate (a positive change implies an appreciation). Among the regressors, C is the constant, EPFRt refers to the corresponding flow variables. Here EPFR flow variables are calculated as z-scores of equity flows (for the stock market return equation), bond flows (for the bond yields equation), and total portfolio flows (for the exchange rate equation).

In the volatility equation, the conditional variance matrix Dt includes the conditional variance of each asset returns,

Dt=(σs,t2000σb,t2000σe,t2)

where each σi,t2 (i stands for s, b, or e) is assumed to follow a GARCH (1, 1) process, with the VIX as an additional regressor.24

σi,t2=cσ,i+γiσi,t12+δii,t12+θiVIXt

In the correlation matrix R the conditional correlations ρi,j among the three asset prices are allowed to be time-varying.

Rt=(1ρsb,tρse,tρsb,t1ρbe,tρse,tρbe,t1)Rt=diag(Qt)1/2Qtdiag(Qt)1/2Qt=(1λ1λ2)R+λ1˜t1ε˜t1+λ2Qt1

where ˜t=Dt1/2εt is a m × 1 vector of standardized residuals, λ1 and λ2 are the parameters that govern the dynamics of conditional correlations; they are both non-negative and satisfy λ1 + λ2 < 1. The R matrix is a weighted average of the unconditional covariance matrix of the standardized residuals ˜t.

To compare the crisis and non-crisis periods, a crisis dummy and an interaction term between the crisis dummy (August 2008 to June 2009) and capital flows is added to the mean equations to examine the potential differential effect of capital flows during the global financial crisis (GFC) period, while the volatility equation remains the same as in the baseline.

(StBtEt)=(CsCbCe)+(Cs1Cb1Ce1)Dummyt+(βsαsβs1βbαbβb1βeαeβe1)(EPFRtVIXtEPFRtDummyt)+(εs,tεb,tεe,t)

The model is estimated for each country separately by maximum likelihood. The log-likelihood function based on the multivariate normal distribution for observation t is

lt=0.5mlog(2π)0.5log{det(R)}log{det(Dt1/2)}0.5tR1t

Where t=Dt1/2εt is a mxl vector of standardized residuals. The log-likelihood function is t=1Tlt.

IV. Empirical results

Overall, the dynamics of asset price returns and their cross-correlations appear to be well-captured by the DCC-MGARCH(1,1) model, with the ARCH and the GARCH effects as well as the adjustment parameters statistically significant in most cases across all three assets and their dynamic correlations. Details on the interpretation of results are as follows.

A. Impact of Capital Flows on the Level of Asset Returns

The estimation results show that portfolio inflows have an economically significant impact on asset returns, especially during the global financial crisis.25,26

  • In the case of the stock market, the impact of foreign equity flows in EMs seems to be small in emerging Asia, where a 0.1 percent GDP increase in equity inflows27 leads on average to a 1.6 percentage point increase in stock market returns, while the impact is larger in Latin America (7 percentage points) and significantly larger for emerging Europe (20 percentage points). In addition, for both emerging Asia and emerging Europe, the impact of EPFR flows increase sharply during the crisis, when the same amount of outflows led to 11 and 100 percentage point declines in stock returns, respectively.28 Admittedly, this finding might reflect omitted factors, such as domestic investors selling off at the same time as foreign investors during the crisis, or shrinking market liquidity leading to a larger price impact of a given capital outflow, though effects of these omitted factors should partially be captured by the crisis dummy included in the equation.

  • In the bond market, the average effect of foreign bond inflows on yields is also small in normal times, and it is relatively larger in emerging Asia (where a 0.1 percent GDP increase of inflows drives down yields by around 40 basis points) compared to Latin America and emerging Europe (20 basis points). Similar to the stock market, the effect increases sharply during the crisis for emerging Asia, where a 0.1 percent GDP increase of outflows coincided with an increase in yields by 100 basis points.29

  • For exchange rates, the average effect of flows on returns is similar across all regions during normal times, where a 0.1 percent GDP increase of flows leads to 0.4-0.8 percent exchange rate appreciation. The effect becomes three times larger during the crisis for emerging Asia (driven by India and Indonesia) and five times larger for Latin America (driven by Argentina, Brazil and Mexico). For emerging Europe, portfolio flows do not seem to have a stronger impact on exchange rates during the crisis. This could reflect the fact that several currencies in emerging Europe are pegged to euro, implying that their exchange rate vis-à-vis the U.S. dollar therefore does not vary with country-specific flows.

Figure 7:
Figure 7:

Impact of Equity Flows on Stock Returns

(Percentage change in equity return per 0.1 percent GDP increase in equity flows)

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Figure 8:
Figure 8:

Impact of Bond Flows on Bond Yields

(Basis point change in bond yields per 0.1 percent GDP increase in bond flows)

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Figure 9:
Figure 9:

Impact of Portfolio Flows on Exchange Rate

(Percentage point appreciation per per 0.1 percent GDP increase in portfolio flows)

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

B. Impact of Global Risk Aversion on the Volatility of Asset Returns

The analysis shows that changes in global risk aversion have significant effects on asset price volatilities across regions. An increase in the VIX—a rise in global risk aversion—increases the volatility of all three asset prices, with the impact more pronounced for bonds. On average, a 10 unit increase in the VIX increases stock return variance by around 0.5,30 without significant regional difference; the impact on bond market variance ranges from 0.6 to 1.0, with Latin American economies featuring the largest impact; for the exchange rate, a 10 unit increase in the VIX increases the variance of currency returns by around 0.7 in emerging Europe and Latin America, while the impact is much smaller in emerging Asia, partly reflecting the more managed exchange rate regimes. Figure 11 shows the model’s implied conditional volatility of asset prices for each region. For all the asset markets, the conditional volatility skyrocketed as VIX spiked, especially during the Lehman event and the peak of the euro crisis around end-2011.

Figure 10:
Figure 10:

Impact of VIX on Asset Volatility cross Regions

(Increase in volatility per 10 unit increase in the VIX)

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Figure 11.
Figure 11.

VIX and Conditional Volatility of Asset Returns in Emerging Markets

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

The average regional effect masks important cross-country variation. While the average impact of the VIX does not differ significantly on average across regions, there is still wide cross-country variation, which appears to correlate with country characteristics:31

  • The impact of the VIX on stock market volatility is larger in economies with very high degrees of financial openness.32 There are various measures of financial openness in the literature; here we use the ratio of portfolio liabilities to GDP, which relates a priori more closely to the financial transmission mechanism for VIX shocks. For financial centers such as Hong Kong SAR and Singapore, the effect of the VIX on stock volatility is more than twice as large as in financially more closed economies like China and Colombia.

  • The impact of the VIX on bond market volatility correlates with indicators of macroeconomic stability of the host country, such as inflation and the current account balance. In economies where inflation has been persistently high, bond yield volatility reacts more strongly to changes in global risk sentiment. For example, in Turkey and Argentina, the impact of the VIX on 10-year bond yield volatility is more than twice as large as in Malaysia and Thailand. Similarly, bond yield volatility in current account surplus countries tends to exhibit less sensitivity to global risk aversion shocks.

  • The impact of VIX on bond yield volatility also declines for shorter maturities. For most emerging economies in the study, the VIX has a significant effect on 10-year bond yields. By contrast, for shorter maturities, including five-year and one-year bonds, the effect is only significant for a few countries. Furthermore, the figure below shows that for these countries, the effect of the VIX typically becomes smaller as maturity shortens. This could reflect that short-term bond yields are more closely related to monetary policy, while long-term bond yields are more sensitive to external risk factors.

  • The impact of the VIX on exchange rate volatility depends on the rigidity of the exchange rate regime. In economies where the currency is pegged against U.S. dollar or heavily managed (China), the VIX does not have any significant impact on the exchange rate. But in countries with more flexible exchange rate regimes, such as Colombia and Mexico, the impact of the VIX on exchange rate volatility can be quite large, with a 10 units rise in the VIX increasing volatility by 0.1.

    Interestingly, while the VIX has limited impact on exchange rate volatility when the currency is heavily managed, its impact on bond prices seems to be amplified in these economies, potentially due to the inability of the exchange rate to serve as a shock absorber.33

Figure 12:
Figure 12:

Impact of VIX on Stock Volatility vs. Financial Openness

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Source: IMF staff estimates.Note: Financial openness measured as absolute size of portfolio liabilities in percentage of GDP, 2003-12 average.
Figure 13:
Figure 13:

Impact of VIX on Bond Yields Volatility vs. Inflation

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Source: IMF staff estimates.Note: 10-year bond yields used in the analysis. Inflation is 2003-12 average.
Figure 14:
Figure 14:

Impact of VIX on Bond Yields Volatility vs. CA Balance

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Source: IMF staff estimates.Note: 10-year bond yields are used in the analysis. Current account balance is 2003-12 average.
Figure 15:
Figure 15:

Impact of VIX on Exchange Rate Volatility vs. Exchange Rate Regime

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Source: IMF staff estimates.Note: The exchange rate regime index is based on Ilzetzki, Reinhart and Rogoff (2008), where a larger number indicates a more flexible exchange rate regime. The index for Bulgaria is reclassified from 2 to 12, as the currency is pegged against Euro, which is free floating against US dollar.
Figure 16:
Figure 16:

Impact of VIX on Bond Yields Volatility vs. Exchange Rate Regime

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Source: IMF staff estimates.Note: 10-year bond yields are used in the analysis. The exchange rate regime index is based on Ilzetzki, Reinhart and Rogoff (2008), where a larger number indicates a more flexible exchange rate regime. The index for Bulgaria is reclassified from 2 to 12, as the currency is pegged against Euro, which is free floating against US dollar.

C. Spillovers across Asset Markets

Asset prices tend to exhibit strong co-movements across different markets.34 The estimated correlations show that exchange rate changes are generally more closely related to stock market returns than they are to changes in bond yields, especially in emerging Asia.35 This might reflect that equity flows convey more private information on growth prospect of the economy than bond flows.36 Thus, equity flows might have a greater price impact on the domestic currency, leading to a closer linkage between stock prices and the exchange rate than between bond yields and the exchange rate.

Figure 17:
Figure 17:

Correlation between Equity Returns and Exchange Rate Returns

(full-sample average)

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Figure 18:
Figure 18:

Correlation between Change in Bond Yields and Exchange Rate Returns

(full-sample average)

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Note: The correlations between change in bond yields and exchange rate returns here are shown in absolute values.

A natural question to ask in the literature on cross-market spillovers is whether asset market co-movements become stronger during crisis compared to non-crisis times. Figure 19 shows the dynamic correlation for selected countries. The time-varying correlations between each pair among the three asset types are volatile and do not appear to exhibit similar patterns across different emerging economies. This heterogeneity could be attributable to differences in the size, liquidity, and degree of openness of each type of financial market in a particular economy. Nonetheless, for most cases, the cross-asset co-movements are generally above their sample averages during the global financial crisis and also the “tapering tantrum” episodes. This could reflect confidence contagion across markets (herding behavior) or liquidity constraints faced by portfolio investors. The observed increase in cross-market spillovers during these “risk-off” episodes calls for a better understanding of cross-market linkages, as they may have important implications for preventive policy measures to avoid joint crashes of asset markets especially in emerging markets.

Figure 19.
Figure 19.

Time-Varying Conditional Correlations of Asset Markets (Selected Countries)

Citation: IMF Working Papers 2014, 156; 10.5089/9781498340229.001.A001

Note: Time-varying correlations are estimated based on the Dynamic Conditional Correlation model of MGARCH. The figure shows correlations between equity returns, change in bond yields, and exchange rate appreciation. The correlations between change in bond yields and the other asset returns are shown in absolute terms (i.e., with the negative signs omitted), so that positive figures indicate co-movements of the bond market and the other asset markets.

V. Conclusions

In recent years, capital flows to emerging markets have become increasingly large and volatile. At the same time, asset prices in EMs have also experienced large swings, in many instances coinciding with episodes of capital flow surges and reversals. This begs the question of whether, and if so to what extent, these cross-border flows drive asset price volatility in EMs. Using weekly EPFR portfolio flows and a Dynamic Conditional Correlation Multivariate GARCH framework, this paper analyzes the effect of capital flows and global risk aversion on the level and volatility of three financial asset prices (stock market returns, bond yields and exchange rate variations) in 17 emerging economies.

The analysis suggests that EPFR flows have a significant effect on asset prices, which was magnified during the global financial crisis. The impact of foreign equity and bond flows on the three asset prices is relatively small during normal times across regions, while it was typically amplified by 5–10 times during the crisis—although this may have also reflected other concomitant factors such as shrinking market liquidity and/or sell-off by domestic investors. We also find that portfolio flows as captured in EPFR are largely driven by global push factors at high frequency. Domestic pull factors appear to be a smaller but more persistent contributor to portfolio flow variation. This finding implies that global financial factors may be relatively more important in driving short-run portfolio flow fluctuations, while the buildup of foreign portfolio investment positions over time may be more related to domestic macroeconomic fundamentals of the recipient economy.

The analysis also shows that global risk aversion has a significant impact on the volatility of EM asset prices, with the magnitude of this effect varying with country characteristics. In particular, the impact of the VIX on stock market volatility is correlated with the financial openness of the country, as measured by total financial liabilities as a percent of GDP. The more exposed a country is to external fund flows, the greater is the volatility spillover stemming from higher global risk aversion to the domestic equity market. However, no similar pattern is observed in the bond market. In contrast, it appears that the sensitivity of bond yield volatility to the VIX correlates more closely with domestic fundamentals such as those related to macroeconomic stability, especially inflation and the current account balance. The impact is also most pronounced at the longer end of the yield curve. Regarding exchange rate volatility, the spillover effect of the VIX unsurprisingly depends on the exchange rate regime, with more managed currencies showing much less sensitivity to global risk aversion. Interestingly, the impact of the VIX on bond yield volatility seems to be amplified in these (managed currency) economies, possibly due to the inability of the exchange rate to serve as a shock absorber.

Overall, we find that as a country’s degree of financial integration rises, domestic asset prices are likely to become more susceptible to global risk aversion shocks. More rigid exchange regimes could help dampen the impact on exchange rate, but potentially at the cost of introducing more volatility in other asset markets. In any event, solid macroeconomic fundamentals appear to provide important buffers to international contagion. In particular, sustaining low inflation and avoiding unsustainably large current account deficits may significantly reduce the sensitivity of bond prices to global shocks.

Appendix I. Summary Statistics of EPFR Flows

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Appendix II. Impulse Responses of Total Fund Flows to Global and Domestic Factors

(One week and cumulative 4-week impact)

Appendix III. Country-Specific DCC-MGARCH Estimates

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z-statistics in parentheses*** p<0.01, ** p<0.05, * p<0.1
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z-statistics in parentheses*** p<0.01, ** p<0.05, * p<0.1
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z-statistics in parentheses*** p<0.01, ** p<0.05, * p<0.1

Country-Specific DCC-MGARCH Estimates with Crisis Dummy

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z-statistics in parentheses*** p<0.01, ** p<0.05, * p<0.1