spot prices, although only in the short run. Moreover, financial activity appears to have exacerbated the volatility in the …

speculative trading increases. As a result, market liquidity deteriorates and short-term volatility rises. Our findings hold for a …

In this paper we examine the quantitative effects of margin regulation on volatility in asset markets. We consider a … of collateral constraints leads to strong excess volatility. Thus, a regulation of margin requirements may have … in the regulation of one class of assets may have only small effects on these assets' return volatility if investors have …

returns and the equity variance premium. We evaluate a plethora of state-of-the-art volatility forecasting models to produce …

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 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 …