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Comparing Voting by Committees According to Their Manipulability

Author

Listed:
  • R. Pablo Arribillaga
  • Jordi Massó

Abstract

We consider the class of voting by committees to be used by a society to collectively choose a subset from a given set of objects. We offer a simple criterion to compare two voting by committees without dummy agents according to their manipulability. This criterion is based on the set-inclusion relationships between the two corresponding pairs of sets of objects, those at which each agent is decisive and those at which each agent is vetoer. We show that the binary relation "to be as manipulable as" endows the set of equivalence classes of anonymous voting by committees (i.e., voting by quotas) with a complete upper semilattice structure, whose supremum is the equivalence class containing all voting by quotas with the property that the quota of each object is strictly larger than one and strictly lower than the number of agents. Finally, we extend the comparability criterion to the full class of all voting by committees.

Suggested Citation

  • R. Pablo Arribillaga & Jordi Massó, 2017. "Comparing Voting by Committees According to Their Manipulability," American Economic Journal: Microeconomics, American Economic Association, vol. 9(4), pages 74-107, November.
    • Handle: RePEc:aea:aejmic:v:9:y:2017:i:4:p:74-107
    Note: DOI: 10.1257/mic.20160107
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    Citations

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    Cited by:

    1. Arribillaga, R. Pablo & Bonifacio, Agustín G., 2024. "Obvious manipulations of tops-only voting rules," Games and Economic Behavior, Elsevier, vol. 143(C), pages 12-24.
    2. DECERF, Benoit & VAN DER LINDEN, Martin, 2016. "A criterion to compare mechanisms when solutions are not unique, with applications to constrained school choice," LIDAM Discussion Papers CORE 2016033, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
    3. Van der Linden, Martin, 2017. "Impossibilities for strategy-proof committee selection mechanisms with vetoers," Journal of Mathematical Economics, Elsevier, vol. 73(C), pages 111-121.
    4. Decerf, Benoit & Van der Linden, Martin, 2021. "Manipulability in school choice," Journal of Economic Theory, Elsevier, vol. 197(C).
    5. Núñez, Matías & Pimienta, Carlos & Xefteris, Dimitrios, 2022. "On the implementation of the median," Journal of Mathematical Economics, Elsevier, vol. 99(C).

    More about this item

    JEL classification:

    • D71 - Microeconomics - - Analysis of Collective Decision-Making - - - Social Choice; Clubs; Committees; Associations
    • D72 - Microeconomics - - Analysis of Collective Decision-Making - - - Political Processes: Rent-seeking, Lobbying, Elections, Legislatures, and Voting Behavior

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