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On strategy-proofness and essentially single-valued cores: A converse result

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  • Koji Takamiya

    () (Graduate School of Economics and Business Administration, Hokkaido University, Kita9 Nishi7 Sapporo 060-0809 Japan)

Abstract

In a general model of indivisible good allocation, Sönmez (1999) established that, whenever the core is nonempty for each preference profile, if an allocation rule is strategy-proof, individually rational and Pareto optimal, then the rule is a selection from the core correspondence, and the core correspondence must be essentially single-valued. This paper studies the converse claim of this result. I demonstrate that whenever the preference domain satisfies a certain condition of `richness', if the core correspondence is essentially single-valued, then any selection from the core correspondence is strategy-proof (even weakly coalition strategy-proof, in fact). In particular, on the domain of preferences in which each individual has strict preferences over his own assignments and there is no consumption externality, such an allocation rule is coalition strategy-proof. And on this domain, coalition strategy-proofness is equivalent to Maskin monotonicity, an important property in implementation theory.

Suggested Citation

  • Koji Takamiya, 2003. "On strategy-proofness and essentially single-valued cores: A converse result," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 20(1), pages 77-83.
  • Handle: RePEc:spr:sochwe:v:20:y:2003:i:1:p:77-83
    Note: Received: 22 February 2000/Accepted: 22 January 2002
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    Cited by:

    1. Koji Takamiya, 2006. "Preference Revelation Games and Strong Cores of Allocation Problems with Indivisibilities," ISER Discussion Paper 0651, Institute of Social and Economic Research, Osaka University.
    2. Koji Takamiya, 2006. "Domains of Social Choice Functions on which Coalition Strategy-Proofness and Maskin Monotonicity are Equivalent," ISER Discussion Paper 0668, Institute of Social and Economic Research, Osaka University.
    3. Takamiya, Koji, 2007. "Domains of social choice functions on which coalition strategy-proofness and Maskin monotonicity are equivalent," Economics Letters, Elsevier, vol. 95(3), pages 348-354, June.
    4. Bettina Klaus & Olivier Bochet, 2013. "The relation between monotonicity and strategy-proofness," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 40(1), pages 41-63, January.
    5. Carmelo Rodríguez-Álvarez, 2009. "Strategy-proof coalition formation," International Journal of Game Theory, Springer;Game Theory Society, vol. 38(3), pages 431-452, November.
    6. Ehlers, Lars & Masso, Jordi, 2007. "Incomplete information and singleton cores in matching markets," Journal of Economic Theory, Elsevier, vol. 136(1), pages 587-600, September.
    7. Takamiya, Koji, 2009. "Preference revelation games and strong cores of allocation problems with indivisibilities," Journal of Mathematical Economics, Elsevier, vol. 45(1-2), pages 199-204, January.
    8. repec:ebl:ecbull:v:4:y:2004:i:10:p:1-8 is not listed on IDEAS
    9. Mizukami, Hideki & Wakayama, Takuma, 2009. "The relation between non-bossiness and monotonicity," Mathematical Social Sciences, Elsevier, vol. 58(2), pages 256-264, September.

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