We propose a new approach to measuring the effect of unobservable private information or beliefs on volatility. Using … high-frequency intraday data, we estimate the volatility effect of a well identified shock on the volatility of the stock … that, as the publicly available information becomes stale, volatility effects and its persistance should increase, as the …

This paper examines the effect of macroeconomic releases on stock market volatility through a Poisson … relevant to explain jump dynamics and improve volatility forecasts on event days is provided. -- Conditional jump intensity … ; conditional volatility ; macroeconomic announcements …

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 …