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When Will Mean-Variance Efficient Portfolios Be Well Diversified?

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  • Green, Richard C
  • Hollifield, Burton

Abstract

The authors characterize the conditions under which efficient portfolios put small weights on individual assets. These conditions bound mean returns with measures of average absolute covariability between assets. The bounds clarify the relationship between linear asset pricing models and well-diversified efficient portfolios. The authors argue that the extreme weightings in sample efficient portfolios are due to the dominance of a single factor in equity returns. This makes it easy to diversify on subsets to reduce residual risk, while weighing the subsets to reduce factor risk simultaneously. The latter involves taking extreme positions. This behavior seems unlikely to be attributable to sampling error. Copyright 1992 by American Finance Association.

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Bibliographic Info

Article provided by American Finance Association in its journal Journal of Finance.

Volume (Year): 47 (1992)
Issue (Month): 5 (December)
Pages: 1785-809

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Handle: RePEc:bla:jfinan:v:47:y:1992:i:5:p:1785-809

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