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arXiv 2009.04173econ.TH
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随机非期望效用:非均匀性

Random Non-Expected Utility: Non-Uniqueness

Yi-Hsuan Lin

摘要:

在随机期望效用(Gul and Pesendorfer,2006)中,偏好的分布可以从随机选择中唯一地恢复。本文通过两个例子说明,如果风险偏好是随机的,但不符合期望效用理论,则这种唯一性一般不成立。在第一种情况下,即使所有偏好都局限于介数类(Dekel,1986)并且是适当单调的,也会获得非唯一性。第二个例子说明了与随机期望效用一致的随机选择行为,该随机选择行为也与随机非期望效用一致。另一方面,我们发现,如果风险偏好符合加权效用理论(Chew,1983),并且在一阶随机优势下是单调的,那么随机选择再次唯一地确定了偏好的分布。最后,我们认为,根据域的风险偏好,唯一性可能会恢复,如果联合分布的选择在有限数量的可行集。

英文摘要:

In random expected utility (Gul and Pesendorfer, 2006), the distribution of preferences is uniquely recoverable from random choice. This paper shows through two examples that such uniqueness fails in general if risk preferences are random but do not conform to expected utility theory. In the first, non-uniqueness obtains even if all preferences are confined to the betweenness class (Dekel, 1986) and are suitably monotone. The second example illustrates random choice behavior consistent with random expected utility that is also consistent with random non-expected utility. On the other hand, we find that if risk preferences conform to weighted utility theory (Chew, 1983) and are monotone in first-order stochastic dominance, random choice again uniquely identifies the distribution of preferences. Finally, we argue that, depending on the domain of risk preferences, uniqueness may be restored if joint distributions of choice across a limited number of feasible sets are available.

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