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 persistence should increase, as the …

. It shows that similar press releases generate less market volatility, but that more substantial textual changes after a … sequence of very similar statements lead to much larger volatility …

filtered using EGARCH specifications. The estimation results show that upgrades do not have significant effects on volatility …, but downgrades increase stock and bond market volatility. Contagion is present, with sovereign rating announcements … (increase) in volatility in other countries. The empirical results show also a financial gain and risk (value-at-risk) reduction …

We provide evidence that changes in the equity price and volatility of individual firms (measures that approximate the … fluctuations in a number of countries. Specifically, adding the return and the volatility of firm-level equity prices to aggregate …