Disambiguation of Ellsberg equilibria in 2x2 normal form games

Benoît Decerf () and Frank Riedel

No 554, Center for Mathematical Economics Working Papers from Center for Mathematical Economics, Bielefeld University

Abstract: Riedel and Sass (2013) study complete information normal form games in which ambiguity averse players use ambiguous randomization strategies, in addition to pure and mixed strategies. The solution concept they propose, the Ellsberg equilibrium, is a coarsening of the classical Nash equilibrium. We provide a foundation of the new equilibrium concept in the spirit of Harsanyi. We prove an extension of the Purification Theorem for 2x2 normal form games. Our result implies that any Ellsberg equilibrium of such game is the limit case of a mixed strategy equilibrium in a disturbed version of the game for which payoffs are ambiguously disturbed.

Keywords: Knightian uncertainty; Ellsberg games; Ambiguity aversion; Purification; Disambiguation (search for similar items in EconPapers)
Pages: 43
Date: 2016-03-03
New Economics Papers: this item is included in nep-gth, nep-hpe, nep-mic and nep-upt
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Citations: View citations in EconPapers (1)

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https://pub.uni-bielefeld.de/download/2901361/2901363 First Version, 2016 (application/x-download)

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Persistent link: https://EconPapers.repec.org/RePEc:bie:wpaper:554

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