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Solidarity and efficiency in preference aggregation: A tale of two rules

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  • Athanasoglou, Stergios

Abstract

This paper is concerned with preference-aggregation rules satisfying desirable efficiency and solidarity requirements. We formulate weaker versions of existing solidarity axioms and show how they imply, in conjunction with strategy-proofness, the existence of reference outcomes holding privileged status. We propose a new class of rules, fixed-order status-quo rules, that can be productively contrasted to their closest counterparts in the literature, status-quo rules based on the least upper bound of a lattice. Fixed-order status-quo rules satisfy stronger efficiency requirements than lattice status-quo rules but have weaker, though still significant, solidarity properties. A subfamily based on lexicographic orders is analyzed further. Fixed-order status-quo rules are characterized by strategy-proofness, strong efficiency, and a third axiom, unanimity-basedness.

Suggested Citation

  • Athanasoglou, Stergios, 2019. "Solidarity and efficiency in preference aggregation: A tale of two rules," Games and Economic Behavior, Elsevier, vol. 118(C), pages 126-140.
    • Handle: RePEc:eee:gamebe:v:118:y:2019:i:c:p:126-140
    DOI: 10.1016/j.geb.2019.08.013
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    References listed on IDEAS

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    1. Sidartha Gordon, 2007. "Solidarity in choosing a location on a cycle," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 29(1), pages 125-147, July.
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    3. Sidartha Gordon, 2015. "Unanimity in attribute-based preference domains," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 44(1), pages 13-29, January.
    4. Gordon, Sidartha, 2007. "Public decisions: Solidarity and the status quo," Games and Economic Behavior, Elsevier, vol. 61(2), pages 225-241, November.
    5. Thomson, William, 1983. "Problems of fair division and the Egalitarian solution," Journal of Economic Theory, Elsevier, vol. 31(2), pages 211-226, December.
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    7. William Thomson, 1983. "The Fair Division of a Fixed Supply Among a Growing Population," Mathematics of Operations Research, INFORMS, vol. 8(3), pages 319-326, August.
    8. Harless, Patrick, 2016. "Solidarity in preference aggregation: Improving on a status quo," Games and Economic Behavior, Elsevier, vol. 95(C), pages 73-87.
    9. Bossert, Walter & Sprumont, Yves, 2014. "Strategy-proof preference aggregation: Possibilities and characterizations," Games and Economic Behavior, Elsevier, vol. 85(C), pages 109-126.
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    Cited by:

    1. Bandhu, Sarvesh & Lahiri, Abhinaba & Pramanik, Anup, 2020. "A characterization of status quo rules in the binary social choice model," Economics Letters, Elsevier, vol. 191(C).
    2. Stergios Athanasoglou & Somouaoga Bonkoungou & Lars Ehlers, 2023. "Strategy-proof preference aggregation and the anonymity-neutrality tradeoff," Working Papers 519, University of Milano-Bicocca, Department of Economics.

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    More about this item

    Keywords

    Social choice; Preference aggregation; Solidarity; Efficiency; Strategy-proofness; Status quo rules;
    All these keywords.

    JEL classification:

    • D71 - Microeconomics - - Analysis of Collective Decision-Making - - - Social Choice; Clubs; Committees; Associations
    • C70 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - General

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