equity market returns and volatility over the period 1998–2006. First, both types of news have a significant impact on market … reports lowers price volatility. Finally, American emerging markets react more to U.S. news than non-American markets …

idiosyncratic volatility and subsequent stock returns (the idiosyncratic volatility puzzle). We find that surprisingly many existing … puzzle in individual stocks and 78-84% of the puzzle in idiosyncratic volatility-sorted portfolios. Our methodology can be …

. Announcements of both institutes are also clearly and immediately reflected in the volatility, which remains at a significantly … higher level for approximately two minutes slightly elevated for approximately 15 minutes. Combining returns and volatility … in a GARCH(1,1)-model, the paper reveals that significant increases in volatility only show up in the presence of …

on subsequent stock market returns and exacerbates stock market volatility. Furthermore, stocks with large, negative …

Aggregate implied volatility spread (IVS), defined as the cross-sectional average difference in the implied …