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The Anscombe–Aumann representation and the independence axiom: a reconsideration

Abhinash Borah () and Christopher Kops ()
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Abhinash Borah: Shiv Nadar University
Christopher Kops: Goethe-University Frankfurt and Graduate School of Economics, Finance and Management

Theory and Decision, 2016, vol. 80, issue 2, pages 211-226

Abstract: Abstract We provide a new behavioral foundation for subjective expected utility (SEU) within the Anscombe–Aumann framework. In contrast to the original axiomatization of SEU, our behavioral foundation establishes that to be consistent with SEU maximization, we need not explicitly assume that preferences satisfy the independence axiom over the domain of all acts. Rather, the substantive implications of independence for an SEU representation may equivalently be derived from less demanding conditions over certain smaller classes of acts. These acts, which we refer to as uncertainty-free comparable acts, have the property that they are relatively simple for a decision maker to compare because she can rank acts within any such class based on her risk preferences alone, without having to consider the underlying uncertainty. Acts of this kind comprise constant acts and acts that are almost identical in the sense that they differ from one another in at most one state.

Keywords: Subjective expected utility; Anscombe–Aumann model; Independence axiom; Uncertainty-free comparable acts (search for similar items in EconPapers)
Date: 2016
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