Two-Group Contests with Communication Within and Between Groups

Part of the Springer Series in Game Theory book series (SSGT)


We consider a two-group contest game with weakest-link social composition functions and convex cost functions and prove the existence of a unique group-proof Nash equilibrium. Such a refinement of the Nash equilibrium prescribes the same communication possibilities as those required by a coalition-proof Nash equilibrium—in the precise sense of Bernheim et al. (J Econ Theory 42:1–12, 1987)—only among the contenders of the same group and between the two groups. We show how a fictitious game with “most inefficient fictitious contenders” can be constructed to prove the existence of a unique group-proof Nash equilibrium of the original two-group contest game. An example evidences that cautious arguments on the (twice) differentiability of cost functions must be used in such a construction.


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© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Dipartimento di scienze economiche e statisticheUniversità degli studi di Napoli Federico IINaplesItaly

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