By Prigogine I., Rice S.A. (eds.)
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2007, Financial scenario generation for stochastic multi-stage decision processes as facility location problems, Ann. Oper. Res. 156(1), 257–272. 26 Daniel Kuhn, Panos Parpas, and Ber¸c Rustem Kall, P. : 1994, Stochastic Programming, John Wiley & Sons, Chichester. : 2007a, Aggregation and discretization in multistage stochastic programming, Math. Program. A . Online First. : 2007b, Convergent bounds for stochastic programs with expected value constraints, The Stochastic Programming E-Print Series (SPEPS) .
For the same reason, variance and excess kurtosis are not desirable: both measure deviations from the mean but ignore the sign; Risk Preferences and Loss Aversion in Portfolio Optimization 29 with marginally diminishing utility, losses lower the utility more than profits of the same magnitude would increase it. As a consequence, higher variance and kurtosis, respectively, are accepted only if they are rewarded with an increase in the mean payoff. All things considered, the representative risk averse rational investor should find an investment that optimizes the trade-off between its expected return and expected deviations from it.
It is noteworthy that it is not the assets with the highest volatility or kurtosis or most negative skewness that are avoided; also, in some cases assets that are dominated in the mean-volatility space are included. The main reason for this is the structure of the (higher) co-moments. 5 −1 0 50 100 kurtosis 150 Fig. 1. Assets in the mean-volatility, mean-skewness and mean-kurtosis space. Dots: assets included in at least one portfolio; circles: assets never included. 2 Portfolios under Risk Aversion and Loss Aversion In traditional utility analysis, an investor’s utility of a (future) level of wealth, w is irrespective of his initial wealth w0 .