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When does ‘All Eggs in One Risky Basket’ Make Sense?

Author

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  • G. Boyle

    (Department of Economics, NUI, Maynooth)

  • D. Conniffe

    (Department of Economics, NUI, Maynooth)

Abstract

In an important paper comparing expected utility and mean-variance analysis, Feldstein (1969) examined a simple portfolio problem involving just two assets, one riskless and one risky. He concluded there could easily be ‘plunging’, that is, investment in the risky asset alone. His background assumptions were that the risky asset’s yield was log normally distributed and that the investor’s attitude to risk was expressible by a logarithmic utility. We look at how conclusions are affected by choice of distribution and utility function. While conclusions can depend on choice of distribution, they are remarkably robust to choice within the range of plausible positive distributions. In contrast, conclusions are sensitive to choice of utility function and we find the key determinant to be how much the investor’s relative risk aversion differs from unity and in what direction. Based on historical stock market returns, our analysis implies that the prevalence of diversification that is observed is consistent with a relative risk aversion coefficient of about 2.5.

Suggested Citation

  • G. Boyle & D. Conniffe, 2005. "When does ‘All Eggs in One Risky Basket’ Make Sense?," Economics Department Working Paper Series n1550305, Department of Economics, National University of Ireland - Maynooth.
    • Handle: RePEc:may:mayecw:n1550305
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    References listed on IDEAS

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    1. J. Tobin, 1958. "Liquidity Preference as Behavior Towards Risk," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 25(2), pages 65-86.
    2. Bierwag, G O, 1974. "The Rationale of the Mean-Standard Deviation Analysis: Comment," American Economic Review, American Economic Association, vol. 64(3), pages 431-433, June.
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    7. Martin S. Feldstein, 1978. "A Note on Feldstein's Criticism of Mean-Variance Analysis: A Reply," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 45(1), pages 201-201.
    8. Borch, Karl, 1974. "The Rationale of the Mean-Standard Deviation Analysis: Comment," American Economic Review, American Economic Association, vol. 64(3), pages 428-430, June.
    9. Ormiston, Michael B & Schlee, Edward E, 2001. "Mean-Variance Preferences and Investor Behaviour," Economic Journal, Royal Economic Society, vol. 111(474), pages 849-861, October.
    10. Meyer, Jack, 1987. "Two-moment Decision Models and Expected Utility Maximization," American Economic Review, American Economic Association, vol. 77(3), pages 421-430, June.
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    Cited by:

    1. Trino-Manuel Niguez & Ivan Paya & David Peel & Javier Perote, 2013. "Higher-order moments in the theory of diversification and portfolio composition," Working Papers 18297128, Lancaster University Management School, Economics Department.

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