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Have Individual Stocks Become More Volatile? An Empirical Exploration of Idiosyncratic Risk

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Author Info
John Y. Campbell
Martin Lettau
Burton G. Malkiel
Yexiao Xu

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Abstract

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.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 7590.

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Date of creation: Mar 2000
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Handle: RePEc:nbr:nberwo:7590

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E32 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Business Fluctuations; Cycles
G10 - Financial Economics - - General Financial Markets - - - General (includes Measurement and Data)

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