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Efficiency, communication and honesty

  • Demichelis, Stefano


    (Università degli studi di Pavia)

  • Weibull, Jörgen


    (Dept. of Economics, Stockholm School of Economics)

We here develop a model of pre-play communication that generalizes the cheap-talk approach by allowing players to have a lexicographic preference, second to the payoffs in the underlying game, for honesty. We formalize this by way of an honesty (or truth) correspondence between actions and statements, and postulate two axioms met by natural languages. The model is applied to finite and symmetric two-player games and we establish that honest communication and play of the Pareto dominant Nash equilibrium together characterize the unique evolutionarily stable set in generic and symmetric n×n-coordination games. In particular, this holds even in Aumann's (1990) example of a Pareto dominant equilibrium that is not self-enforcing.

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Paper provided by Stockholm School of Economics in its series SSE/EFI Working Paper Series in Economics and Finance with number 645.

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Length: 22 pages
Date of creation: 01 Feb 2006
Date of revision: 28 Nov 2006
Publication status: Forthcoming in American Economic Review.
Handle: RePEc:hhs:hastef:0645
Contact details of provider: Postal: The Economic Research Institute, Stockholm School of Economics, P.O. Box 6501, 113 83 Stockholm, Sweden
Phone: +46-(0)8-736 90 00
Fax: +46-(0)8-31 01 57
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