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Robust Portfolio Choices and Asset Holdings

Author

Listed:
  • Giannis Vardas

    (University of Crete, Department of Economics)

  • Anastasios Xepapadeas

    (University of Crete, Department of Economics)

Abstract

Optimal portfolio rules are derived under uncertainty aversion by formulating the portfolio choice problem as a robust control problem. Using a constant relative risk aversion (CRRA) utility function, we present the solution of the robust portfolio choice problem in the cases of one and two risky assets. For the two risky assets and one risk-free asset case, we show that under uncertainty aversion and when volatility of the one asset is substantially high than that of the other, the total holdings of risky assets as a proportion of the investor's wealth could increase as compared to the holdings under the Merton rule, which is the standard risk aversion case. This result indicates a more aggressive behaviour under risk aversion and robust control policies, which goes against the general beliefs, but which agrees with more recent findings.

Suggested Citation

  • Giannis Vardas & Anastasios Xepapadeas, 2005. "Robust Portfolio Choices and Asset Holdings," Ekonomia, Cyprus Economic Society and University of Cyprus, vol. 8(1), pages 1-20, Summer.
    • Handle: RePEc:ekn:ekonom:v:8:y:2005:i:1:p:1-20
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    More about this item

    JEL classification:

    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • D81 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Criteria for Decision-Making under Risk and Uncertainty

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