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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.

Suggested Citation

  • 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. Szilvia Papai, 2000. "Strategyproof Assignment by Hierarchical Exchange," Econometrica, Econometric Society, vol. 68(6), pages 1403-1434, November.
    2. 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.
    3. 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.
    4. 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.
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    12. 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.
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    Cited by:

    1. Roy, Souvik & Sadhukhan, Soumyarup, 2021. "A unified characterization of the randomized strategy-proof rules," Journal of Economic Theory, Elsevier, vol. 197(C).

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