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When Will Mean-Variance Efficient Portfolios Be Well Diversified?

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Author Info
 Green, Richard C
Hollifield, Burton

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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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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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  1. Andrew Ang & Geert Bekaert, 2003. "How do Regimes Affect Asset Allocation?," NBER Working Papers 10080, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  2. Louis K.C. Chan & Jason Karceski & Josef Lakonishok, 1999. "On Portfolio Optimization: Forecasting Covariances and Choosing the Risk Model," NBER Working Papers 7039, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  3. M. Hashem Pesaran & Paolo Zaffaroni, 2008. "Optimal Asset Allocation with Factor Models for Large Portfolios," CESifo Working Paper Series CESifo Working Paper No. , CESifo Group Munich. [Downloadable!]
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  4. Marco Taboga, 2006. "Robust Portfolio Selection with and without Relative Entropy," The B.E. Journal of Theoretical Economics, Berkeley Electronic Press, vol. 0(1). [Downloadable!]
  5. Alessandro Bucciol & Raffaele Miniaci, 2006. "Optimal asset allocation based on utility maximization in the presence of market frictions," "Marco Fanno" Working Papers 0012, Dipartimento di Scienze Economiche "Marco Fanno". [Downloadable!]
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  6. Taboga, Marco, 2004. "A Simple Model of Robust Portfolio Selection," MPRA Paper 16472, University Library of Munich, Germany. [Downloadable!]
  7. Das, Sanjiv Ranjan & Uppal, Raman, 2002. "Systemic Risk and International Portfolio Choice," CEPR Discussion Papers 3305, C.E.P.R. Discussion Papers. [Downloadable!] (restricted)
  8. A. Craig MacKinlay & Lubos Pastor, 1999. "Asset Pricing Models: Implications for Expected Returns and Portfolio Selection," NBER Working Papers 7162, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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  9. Hlouskova, Jaroslava & Lee, Gabriel S., 2001. "Legal Restrictions on Portfolio Holdings: Some Empirical Results," Economics Series 93, Institute for Advanced Studies. [Downloadable!]
  10. Wayne E. Ferson & Andrew Siegel, 2002. "Stochastic Discount Factor Bounds with Conditioning Information," NBER Working Papers 8789, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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  11. John Knight & Stephen Satchell, 2005. "Exact Properties of Measures of Optimal Investment for Institutional Investors," Birkbeck Working Papers in Economics and Finance 0513, Birkbeck, Department of Economics, Mathematics & Statistics. [Downloadable!]
  12. Gregory H. Bauer & Keith Vorkink, 2007. "Multivariate Realized Stock Market Volatility
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