Abstract
We study the joint dynamics of overnight and daytime return volatility for the Nikkei Stock Average in Tokyo and the Standard and Poor's 500 Stock Index in New York over the recent 1988–92 period. We extend the GARCH framework of Engle (1982) and Bollerslev (1986) to allow for asymmetric effects of negative (“bad news”) and positive (“good news”) foreign market returns shocks for volatility. Our evidence demonstrates that the magnitude and persistence of shocks originating in New York or Tokyo that transmit to the other market are significantly understated if this asymmetric effect is ignored. Implications for pricing of securities within those markets, for hedging and other global trading strategies and for regulatory policies within these financial markets are also discussed.
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