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Susceptibility to Manipulation by Sincere Truncation : the Case of Scoring Rules and Scoring Runoff Systems

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  • Eric Kamwa

    () (LC2S - Laboratoire caribéen de sciences sociales - UA - Université des Antilles - CNRS - Centre National de la Recherche Scientifique)

  • Issofa Moyouwou

    (MASS - Université de Yaoundé I [Yaoundé], Université de Yaoundé I [Yaoundé])

Abstract

A voting rule is said to be vulnerable to the truncation paradox if some voter may favor the election of a more preferable outcome by listing only part of his sincere ranking on the competing candidates than listing his entire preference ranking on all the competing candidates (Brams, 1982, Fishburn and Brams, 1983). For three-candidate elections and for large electorates, this paper provides under the Impartial Anonymous Culture assumption (IAC), an evaluation of the likelihood of the truncation paradox the whole family of the scoring rules and runoff scoring rules.

Suggested Citation

  • Eric Kamwa & Issofa Moyouwou, 2021. "Susceptibility to Manipulation by Sincere Truncation : the Case of Scoring Rules and Scoring Runoff Systems," Post-Print hal-02185965, HAL.
  • Handle: RePEc:hal:journl:hal-02185965
    DOI: 10.1007/978-3-030-48598-6_12
    Note: View the original document on HAL open archive server: https://hal.univ-antilles.fr/hal-02185965v2
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    References listed on IDEAS

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    1. Kuga, Kiyoshi & Nagatani, Hiroaki, 1974. "Voter Antagonism and the Paradox of Voting," Econometrica, Econometric Society, vol. 42(6), pages 1045-1067, November.
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    5. Eric Kamwa, 2019. "On the Likelihood of the Borda Effect: The Overall Probabilities for General Weighted Scoring Rules and Scoring Runoff Rules," Group Decision and Negotiation, Springer, vol. 28(3), pages 519-541, June.
    6. Mostapha Diss & William Gehrlein, 2012. "Borda’s Paradox with weighted scoring rules," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 38(1), pages 121-136, January.
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    Cited by:

    1. Mostapha Diss & Eric Kamwa & Issofa Moyouwou & Hatem Smaoui, 2021. "Condorcet Efficiency of General Weighted Scoring Rules Under IAC: Indifference and Abstention," Studies in Choice and Welfare, in: Mostapha Diss & Vincent Merlin (ed.), Evaluating Voting Systems with Probability Models, pages 55-73, Springer.
    2. Mostapha Diss & Boris Tsvelikhovskiy, 2019. "Manipulable outcomes within the class of scoring voting rules," Papers 1911.09173, arXiv.org, revised Sep 2020.
    3. Eric Kamwa, 2021. "To what extent does the model of processing sincereincomplete rankings affect the likelihood of thetruncation paradox?," Working Papers hal-02879390, HAL.

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