Valuable cheap talk and equilibrium selection
Intuitively, we expect that players who are allowed to engage in costless communication before playing a game would be foolish to agree on an inefficient equilibrium. At the same time, however, such preplay communication has been suggested as a rationale for expecting Nash equilibrium in general. This paper presents a plausible formal model of cheap talk that distinguishes and resolves these possibilities. Players are assumed to have an unlimited opportunity to send messages before playing an arbitrary game. Using an extension of fictitious play beliefs, minimal assumptions are made concerning which messages about future actions are credible and hence contribute to final beliefs. In this environment it is shown that meaningful communication among players leads to a Nash equilibrium (NE) of the action game. Within the set of NE, efficiency then turns out to be a consequence of imposing optimality on the cheap talk portion of the extended game. This finding contrasts with previous "babbling" results.
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- Bergin, J. & Macleod, B., 1989.
"Eficiency And Renegotiation In Repeated Games,"
UFAE and IAE Working Papers
121-89, Unitat de Fonaments de l'Anàlisi Econòmica (UAB) and Institut d'Anàlisi Econòmica (CSIC).
- James Bergin & Bentley MacLeod, 1989. "Efficiency and Renegotiation in Repeated Games," Working Papers 752, Queen's University, Department of Economics.
- MacLeod, B.W. & Bergin, J., 1991. "Efficiency and Renegotiation in Repeated Games," Cahiers de recherche 9118, Universite de Montreal, Departement de sciences economiques.
- MacLeod, B.W. & Bergin, J., 1991. "Efficiency and Renegotiation in Repeated Games," Cahiers de recherche 9118, Centre interuniversitaire de recherche en économie quantitative, CIREQ.
- Joseph Farrell, 1987. "Cheap Talk, Coordination, and Entry," RAND Journal of Economics, The RAND Corporation, vol. 18(1), pages 34-39, Spring.
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