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On anonymous and weighted voting systems

Author

Listed:
  • Josep Freixas

    (Universitat Politècnica de Catalunya (Campus Manresa), EPSEM)

  • Montserrat Pons

    (Universitat Politècnica de Catalunya (Campus Manresa), EPSEM)

Abstract

Many bodies around the world make their decisions through voting systems in which voters have several options and the collective result also has several options. Many of these voting systems are anonymous, i.e., all voters have an identical role in voting. Anonymous simple voting games, a binary vote for voters and a binary collective decision, can be represented by an easy weighted game, i.e., by means of a quota and an identical weight for the voters. Widely used voting systems of this type are the majority and the unanimity decision rules. In this article, we analyze the case in which voters have two or more voting options and the collective result of the vote has also two or more options. We prove that anonymity implies being representable through a weighted game if and only if the voting options for voters are binary. As a consequence of this result, several significant enumerations are obtained.

Suggested Citation

  • Josep Freixas & Montserrat Pons, 2021. "On anonymous and weighted voting systems," Theory and Decision, Springer, vol. 91(4), pages 477-491, November.
    • Handle: RePEc:kap:theord:v:91:y:2021:i:4:d:10.1007_s11238-021-09814-3
    DOI: 10.1007/s11238-021-09814-3
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    References listed on IDEAS

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