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Nash versus coarse correlation

Georgalos, Konstantinos, Ray, Indrajit and SenGupta, Sonali 2020. Nash versus coarse correlation. Experimental Economics 23 , pp. 1178-1204. 10.1007/s10683-020-09647-x

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We run a laboratory experiment to test the concept of coarse correlated equilibrium (Moulin and Vial in Int J Game Theory 7:201–221, 1978), with a two-person game with unique pure Nash equilibrium which is also the solution of iterative elimination of strictly dominated strategies. The subjects are asked to commit to a device that randomly picks one of three symmetric outcomes (including the Nash point) with higher ex-ante expected payoff than the Nash equilibrium payoff. We find that the subjects do not accept this lottery (which is a coarse correlated equilibrium); instead, they choose to play the game and coordinate on the Nash equilibrium. However, given an individual choice between a lottery with equal probabilities of the same outcomes and the sure payoff as in the Nash point, the lottery is chosen by the subjects. This result is robust against a few variations. We explain our result as selecting risk-dominance over payoff dominance in equilibrium.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Business (Including Economics)
Subjects: H Social Sciences > HB Economic Theory
Publisher: Springer Verlag (Germany)
ISSN: 1386-4157
Date of First Compliant Deposit: 2 March 2020
Date of Acceptance: 3 February 2020
Last Modified: 23 Nov 2020 13:11

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