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Robust Rationalizability Under Almost Common Certainty Of Payoffs

  • STEPHEN MORRIS
  • SATORU TAKAHASHI
  • OLIVIER TERCIEUX

An action is robustly rationalizable if it is rationalizable for every type who has almost common certainty of payo�s. We illustrate by means of an example that an action may not be robustly rationalizable even if it is weakly dominant, and argue that robust rationalizability is a very stringent refinement of rationalizability. Nonetheless, we show that every strictly rationalizable action is robustly rationalizable. We also investigate how permissive robust rationalizability becomes if we require that players be fully certain of their own payoffs.

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File URL: http://hdl.handle.net/10.1111/j.1468-5876.2011.00553.x
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Article provided by Japanese Economic Association in its journal Japanese Economic Review.

Volume (Year): 63 (2012)
Issue (Month): 1 (03)
Pages: 57-67

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Handle: RePEc:bla:jecrev:v:63:y:2012:i:1:p:57-67
DOI: j.1468-5876.2011.00553.x
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  1. P. Jean-Jacques Herings & Vincent J. Vannetelbosch, 1998. "The Equivalence of the Dekel-Fudenberg Iterative Procedure and Weakly Perfect Rationalizability," Cowles Foundation Discussion Papers 1173, Cowles Foundation for Research in Economics, Yale University.
  2. Atsushi Kajii & Stephen Morris, . ""The Robustness of Equilibria to Incomplete Information*''," CARESS Working Papres 95-18, University of Pennsylvania Center for Analytic Research and Economics in the Social Sciences.
  3. Frank Schuhmacher, 1999. "Proper rationalizability and backward induction," International Journal of Game Theory, Springer;Game Theory Society, vol. 28(4), pages 599-615.
  4. Pearce, David G, 1984. "Rationalizable Strategic Behavior and the Problem of Perfection," Econometrica, Econometric Society, vol. 52(4), pages 1029-50, July.
  5. Levine, David & Kreps, David & Fudenberg, Drew, 1988. "On the Robustness of Equilibrium Refinements," Scholarly Articles 3350444, Harvard University Department of Economics.
  6. Dekel, Eddie & Fudenberg, Drew & Morris, Stephen, 2007. "Interim correlated rationalizability," Theoretical Economics, Econometric Society, vol. 2(1), pages 15-40, March.
  7. Jonathan Weinstein & Muhamet Yildiz, 2007. "A Structure Theorem for Rationalizability with Application to Robust Predictions of Refinements," Econometrica, Econometric Society, vol. 75(2), pages 365-400, 03.
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