investigate how oil price volatility behaves when the index unexpectedly changes. I find that unexpected increases in the … newspaper index are strongly associated with higher levels of oil price volatility, both realized and implied. In some cases …, interest levels and price volatility appear to be driven by the OPEC event itself, such as the Iraq invasion of Kuwait. In …

apply several GARCH specifications to show that negative and positive news explain the asymmetric effects in the volatility …

reflect information-driven and noise-induced volatilities. We find that all volatility components reveal distinct dynamics and … significantly declines thereafter. Moreover, news-affected responses in all volatility components are influenced by order flow …

direction of company-specific news. Information-implied reactions in returns, volatility as well as liquidity demand and supply … London Stock Exchange (LSE), we find market-wide robust news-dependent responses in volatility and trading volume. However … shown. -- firm-specific news ; news sentiment ; high-frequency data ; volatility ; liquidity ; abnormal returns …

reflect information-driven and noise-induced volatilities. We find that all volatility components reveal distinct dynamics and … significantly declines thereafter. Moreover, news-affected responses in all volatility components are influenced by order flow … imbalances. -- efficient return ; macroeconomic announcements ; microstructure noise ; informational volatility …

. Positive (negative) news have significant positive (negative) effects on stock returns in all cases. Their volatility has a … significant impact on both stock returns and volatility; specifically, an increase in news volatility is always associated with a …

follows. Positive (negative) news have significant positive (negative) effects on stock returns in all cases. Their volatility … has a significant impact on both stock returns and volatility; specifically, an increase in news volatility is always …

reflect information-driven and noise-induced volatilities.We find that all volatility components reveal distinct dynamics and … significantly declines thereafter. Moreover, news-affected responses in all volatility components are influenced by order flow … imbalances. -- effcient return ; macroeconomic announcements ; microstructure noise ; informational volatility …