This paper extends the class of stochastic volatility diffusions for asset returns to encompass Poisson jumps of time … as well as stochastic volatility with a pronounced negative relationship between return and volatility innovations. We …

This paper uses a disaggregated approach to study the volatility of common stocks at the market, industry, and firm … levels. Over the period 1962-97 there has been a noticeable increase in firm-level volatility relative to market volatility …, while the number of stocks needed to achieve a given level of diversification has increased. All the volatility measures …

This paper studies three different measures of monthly stock market volatility: the time-series volatility of daily … market returns within the month; the cross-sectional volatility or 'dispersion' of daily returns on industry portfolios …, within the month. Over the period 1962-97 there has been a noticeable increase in firm-level volatility relative to market …

has also possessed excess volatility' in the past century. It finds no evidence of excess volatility in the pre-World War … I German stock market. By contrast, there is some evidence of excess volatility in the post-World War II German stock … volatility of German stock indices before 1914 …

This paper compares several statistical models for monthly stock return volatility. The focus is on U.S. data from 1834 … volatility that are inconsistent with stationary models for conditional heteroskedasticity, We show the importance of … of stock volatility, even over the 1834-1925 period …

. Assuming that news has only country specific autocorrelation such as a heat wave. any intra-daily volatility spillovers (meteor …. Using a volatility type of vector autoregression we examine the impact of news in one market on the time path of volatility …