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Rationalizable Strategies in Games With Incomplete Preferences

Author

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  • Kokkala, Juho
  • Poropudas, Jirka
  • Virtanen, Kai

Abstract

Games with incomplete preferences are normal-form games where the preferences of the players are defined as partial orders over the outcomes of the game. We define rationality in these games as follows. A rational player forms a set-valued belief of possible strategies selected by the opponent(s) and selects a strategy that is not dominated with respect to this belief. Here, we say a strategy is dominated with respect to the set-valued belief if the player has another strategy that would yield a better outcome according to the player's preference relation, no matter which strategy combination the opponent(s) play among those contained in the belief. We define rationalizable strategies as the logical implication of common knowledge of this rationality. We show that the sets of rationalizable strategies are the maximal mutually nondominated sets, i.e., the maximal sets that contain no dominated strategies with respect to each other. We show that no new rationalizable strategies appear when additional preference information is included. We consider multicriteria games as a special case of games with incomplete preferences and introduce a way of representing incomplete preference information in multicriteria games by sets of feasible weights of the criteria.

Suggested Citation

  • Kokkala, Juho & Poropudas, Jirka & Virtanen, Kai, 2015. "Rationalizable Strategies in Games With Incomplete Preferences," MPRA Paper 68331, University Library of Munich, Germany.
  • Handle: RePEc:pra:mprapa:68331
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    File URL: https://mpra.ub.uni-muenchen.de/68331/1/MPRA_paper_68331.pdf
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    References listed on IDEAS

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    1. Giuseppe De Marco & Jacqueline Morgan, 2007. "A Refinement Concept For Equilibria In Multicriteria Games Via Stable Scalarizations," International Game Theory Review (IGTR), World Scientific Publishing Co. Pte. Ltd., vol. 9(02), pages 169-181.
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    3. Borm, P.E.M. & Tijs, S.H. & van den Aarssen, J.C.M., 1988. "Pareto equilibria in multiobjective games," Other publications TiSEM a02573c0-8c7e-409d-bc75-0, Tilburg University, School of Economics and Management.
    4. Bernheim, B Douglas, 1984. "Rationalizable Strategic Behavior," Econometrica, Econometric Society, vol. 52(4), pages 1007-1028, July.
    5. Sophie Bade, 2005. "Nash equilibrium in games with incomplete preferences," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 26(2), pages 309-332, August.
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    10. John C. Harsanyi, 1967. "Games with Incomplete Information Played by "Bayesian" Players, I-III Part I. The Basic Model," Management Science, INFORMS, vol. 14(3), pages 159-182, November.
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    Cited by:

    1. Yasuo Sasaki, 2019. "Rationalizability in multicriteria games," International Journal of Game Theory, Springer;Game Theory Society, vol. 48(2), pages 673-685, June.

    More about this item

    Keywords

    Normal-form games; incomplete preferences; rationalizable strategies; multicriteria games;

    JEL classification:

    • C72 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Noncooperative Games

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