No Contagion, Only Interdependence: Measuring Stock Market Comovements
Posted: 25 Oct 2002
Heteroscedasticity biases tests for contagion based on correlation coefficients. When contagion is defined as a significant increase in market co-movement after a shock to one country, previous work suggests contagion occurred during recent crises. This paper shows that correlation coefficients are conditional on market volatility. Under certain assumptions, it is possible to adjust for this bias. Using this adjustment, there was virtually no increase in unconditional correlation coefficients (i.e., no contagion) during the 1997 Asian crisis, 1994 Mexican devaluation, and 1987 U.S. market crash. There is a high level of market co-movement in all periods, however, which we call interdependence.
Keywords: Contagion, Correlations, Heteroscedasticity, Interdependence, Comovement, Currency Crises, Asian Crisis, Mexican Crisis
JEL Classification: F30, F40, G15
Suggested Citation: Suggested Citation