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Characterizing Stability Properties in Games with Strategic Substitutes

  • Roy, Sunanda
  • Sabarwal, Tarun

In games with strategic substitutes (GSS), convergence of the best-response dynamic starting from the inf (or sup) of the strategy space is equivalent to global stability (convergence of every adaptive dynamic to the same pure strategy Nash equilibrium). Consequently, in GSS, global stability can be analyzed using a single best response dynamic. Moreover, in GSS, global stability is equivalent to dominance solvability, showing that in this class of games, two different foundations for robustness of predicted outcomes are equivalent, and both can be checked using a single best response dynamic. These equivalences are useful to study stability of equilibria in a variety of applications. Furthermore, in parameterized GSS, under natural conditions, dynamically stable equilibrium selections can be viewed in terms of monotone selections of equilibria. Several examples are provided.

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Paper provided by Iowa State University, Department of Economics in its series Staff General Research Papers with number 32009.

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Date of creation: 28 Sep 2010
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Handle: RePEc:isu:genres:32009
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