Refinements of rationalizability for normal-form games
AbstractThere exist three equivalent definitions of perfect Nash equilibria which differ in the way "best responses against small perturbations" are defined. It is shown that applying the spirit of these definitions to rationalizability leads to three different refinements of rationalizable strategies which are termed perfect (Bernheim, 1984), weakly perfect and trembling-hand perfect rationalizability, respectively. We prove that weakly perfect rationalizability is weaker than both perfect and proper (Schuhmacher, 1995) rationalizability and in two-player games it is weaker than trembling-hand perfect rationalizability. By means of examples, it is shown that no other relationships can be found.
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Bibliographic InfoArticle provided by Springer in its journal International Journal of Game Theory.
Volume (Year): 28 (1999)
Issue (Month): 1 ()
Note: Received: January 1997/final version: August 1998
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Web page: http://link.springer.de/link/service/journals/00182/index.htm
Other versions of this item:
- Herings, P.J.J. & Vannetelbosch, V., 1997. "Refinements of Rationalizability for Normal-Form Games," Discussion Paper 1997-03, Tilburg University, Center for Economic Research.
- HERINGS, P. Jean-Jacques & ANNETELBOSCH, Vincent J., . "Refinements of rationalizability for normal-form games," CORE Discussion Papers RP -1378, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
- HERINGS, Jean - Jacques & VANNETELBOSCH, Vincent, 1997. "Refinements of rationalizability for normal-form games," CORE Discussion Papers 1997002, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
- C72 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Noncooperative Games
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