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Have Individual Stocks Become More Volatile?

其他書名	An Empirical Exploration of Idiosyncratic Risk
出版	National Bureau of Economic Research, 2000
URL	http://books.google.com.hk/books?id=tzuyAAAAIAAJ&hl=&source=gbs_api

註釋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. Accordingly correlations among individual stocks and the explanatory power of the market model for a typical stock have declined, while the number of stocks needed to achieve a given level of diversification has increased. All the volatility measures move together countercyclically and help to predict GDP growth. Market volatility tends to lead the other volatility series. Factors that may be responsible for these findings are suggested.