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Natural selection and social preferences

  • Weibull, Jörgen


    (Dept. of Economics, Stockholm School of Economics)

  • Salomonsson, Marcus


    (Dept. of Economics, Stockholm School of Economics)

A large number of individuals are randomly matched into groups, where each group plays a finite symmetric game. Individuals breed true. The expected number of surviving offspring depends on own material payoff, but may also, due to cooperative breeding and/or reproductive competition, depend on the material payoffs to other group members. The induced population dynamic is equivalent with the replicator dynamic for a game with payoffs derived from those in the original game. We apply this selection dynamic to a number of examples, including prisoners' dilemma games with and without a punishment option, coordination games, and hawk-dove games. For each of these, we compare the outcomes with those obtained under the standard replicator dynamic. By way of a revealed-preference argument, our selection dynamic can explain certain "altruistic" and "spiteful" behaviors that are consistent with individuals having social preferences.

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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 588.

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Length: 34 pages
Date of creation: 28 Feb 2005
Date of revision: 20 Jul 2005
Publication status: Published in Journal of Theoretical Biology, 2006, pages 79-92.
Handle: RePEc:hhs:hastef:0588
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
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