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 …

-of-sample volatility of optimized portfolios from each model. A few factors capture the general covariance structure but adding more … yield similar results. Using a tracking error volatility criterion, larger differences appear, with particularly favorable …

This paper reviews the literature on idiosyncratic equity volatility since the publication of "Have Individual Stocks …, Gharghori, and Zhong and by Leippold and Svaton, and we present volatility estimates through the end of 2021, significantly … period, idiosyncratic volatility declined thereafter; but sharp increases in market, industry, and idiosyncratic volatility …

This paper examines the potential influence of changing volatility in stock market prices on the level of stock market … prices. It demonstrates that volatility is only weakly serially correlated, implying that shocks to volatility do not persist …. These shocks can therefore have only a small impact on stockmarket prices, since changes in volatility affect expected …

) levels of volatility. These results provide a novel perspective on both the equity risk premium and excess volatility puzzles …