This study examines the response of intraday options-implied volatilities to scheduled announcements of major macroeconomic indicators. By analyzing the KOSPI 200 options intraday data, we find that the abnormal implied volatility significantly increases around announcements of macroeconomic...

In this study we analyze how the price impact of trades and the bid-ask spread are related to foreign stock ownership using data from 20 emerging markets. We show that while the price impact of trades increases with the percentage of shares held by foreign investors, the bid-ask spread decreases...