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• W2004226444 abstract "This paper studies monotone risk aversion, the aversion to monotone, mean-preserving increase in risk (Quiggin [21]), in the Rank Dependent Expected Utility (RDEU) model. This model replaces expected utility by another functional, characterized by two functions, a utility function u in conjunction with a probability-perception function f. Monotone mean-preserving increases in risk are closely related to the notion of comparative dispersion introduced by Bickel and Lehmann [3,4] in Non-parametric Statistics. We present a characterization of the pairs (u,f) of monotone risk averse decision makers, based on an index of greediness G u of the utility function u and an index of pessimism P f of the probability perception function f: the decision maker is monotone risk averse if and only if $P_fge G_u$ . The index of greediness (non-concavity) of u is the supremum of $u^{prime}(x)/u^{prime}(y)$ taken over $yleq x$ . The index of pessimism of f is the infimum of ${frac{{1-f(v)}}{{1-v}}}/ {frac{{f(v)}}{{v}}}$ taken over 0 < v < 1. Thus, $G_{u}geq 1$ , with G u = 1 iff u is concave. If $P_{f}geq G_{u}$ then $P_{f}geq 1$ , i.e., f is majorized by the identity function. Since P f = 1 for Expected Utility maximizers, $P_{f}geq G_{u}$ forces u to be concave in this case; thus, the characterization of risk aversion as $P_{f}geq G_{u}$ is a direct generalization from EU to RDEU. A novel element is that concavity of u is not necessary. In fact, u must be concave only if P f = 1." @default.
• W2004226444 created "2016-06-24" @default.
• W2004226444 creator A5050116348 @default.
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• W2004226444 date "2005-04-01" @default.
• W2004226444 modified "2023-10-03" @default.
• W2004226444 title "More pessimism than greediness: a characterization of monotone risk aversion in the rank-dependent expected utility model" @default.
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• W2004226444 doi "https://doi.org/10.1007/s00199-003-0451-7" @default.
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