Portfolio Optimization with Optimal Expected Utility Risk Measures
23 Pages Posted: 30 Jun 2019 Last revised: 19 May 2020
Date Written: June 30, 2019
The purpose of this article is to evaluate optimal expected utility risk measures (OEU) in a risk- constrained portfolio optimization context where the expected portfolio return is maximized. We compare the portfolio optimization with OEU constraint to a portfolio selection model using value at risk as constraint. The former is a coherent risk measure for utility functions with constant relative risk aversion and allows individual specifications to the investor’s risk attitude and time preference. In a case study with three indices we investigate how these theoretical differences influence the performance of the portfolio selection strategies. A copula approach with univariate ARMA-GARCH models is used in a rolling forecast to simulate monthly future returns and calculate the derived measures for the optimization. The results of this study illustrate that both optimization strategies perform considerably better than an equally weighted portfolio and a buy and hold portfolio. Moreover, our results illustrate that portfolio optimization with OEU constraint experiences individualized effects, e.g. less risk averse investors lose more portfolio value in the financial crises but outperform their more risk averse counterparts in bull markets.
Keywords: portfolio optimization, risk measures, value at risk, optimal expected utility
JEL Classification: G11, D81
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