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Pairwise Partition Graphs and Strategy-proof Social Choice in the Exogenous Indifference Class Model

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  • Anup Pramanik
  • Arunava Sen

Abstract

In this paper we consider the exogenous indifference classes model of Barbera and Ehlers (2011) and Sato (2009) and analyze further the relationship between the structure of indifference classes across agents and dictatorship results. The key to our approach is the pairwise partition graph. We provide necessary conditions on these graphs for strategy-proofness and unanimity (or efficiency) to imply dictatorship. These conditions are not sufficient; we also provide separate stronger conditions that are sufficient. A full characterization is obtained in the case of two agents for domains where strategy-proofness and efficiency imply dictatorship.

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  • Anup Pramanik & Arunava Sen, 2014. "Pairwise Partition Graphs and Strategy-proof Social Choice in the Exogenous Indifference Class Model," ISER Discussion Paper 0898, Institute of Social and Economic Research, Osaka University.
  • Handle: RePEc:dpr:wpaper:0898
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    References listed on IDEAS

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    1. Salvador Barberà & Lars Ehlers, 2011. "Free triples, large indifference classes and the majority rule," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 37(4), pages 559-574, October.
    2. Anup Pramanik, 2015. "Further results on dictatorial domains," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 45(2), pages 379-398, September.
    3. Shin Sato, 2012. "On strategy-proof social choice under categorization," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 38(3), pages 455-471, March.
    4. Mark A. Satterthwaite & Hugo Sonnenschein, 1981. "Strategy-Proof Allocation Mechanisms at Differentiable Points," Review of Economic Studies, Oxford University Press, vol. 48(4), pages 587-597.
    5. Sato, Shin, 2009. "Strategy-proof social choice with exogenous indifference classes," Mathematical Social Sciences, Elsevier, vol. 57(1), pages 48-57, January.
    6. Shin Sato, 2010. "Circular domains," Review of Economic Design, Springer;Society for Economic Design, vol. 14(3), pages 331-342, September.
    7. Reny, Philip J., 2001. "Arrow's theorem and the Gibbard-Satterthwaite theorem: a unified approach," Economics Letters, Elsevier, vol. 70(1), pages 99-105, January.
    8. Satterthwaite, Mark Allen, 1975. "Strategy-proofness and Arrow's conditions: Existence and correspondence theorems for voting procedures and social welfare functions," Journal of Economic Theory, Elsevier, vol. 10(2), pages 187-217, April.
    9. Shin Sato, 2014. "A fundamental structure of strategy-proof social choice correspondences with restricted preferences over alternatives," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 42(4), pages 831-851, April.
    10. Dogan, Emre & Sanver, M. Remzi, 2007. "On the alternating use of "unanimity" and "surjectivity" in the Gibbard-Satterthwaite Theorem," Economics Letters, Elsevier, vol. 96(1), pages 140-143, July.
    11. Sen, Arunava, 2001. "Another direct proof of the Gibbard-Satterthwaite Theorem," Economics Letters, Elsevier, vol. 70(3), pages 381-385, March.
    12. Gibbard, Allan, 1973. "Manipulation of Voting Schemes: A General Result," Econometrica, Econometric Society, vol. 41(4), pages 587-601, July.
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