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The two-party system under alternative voting procedures

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  • Arnaud Dellis

Abstract

Countries that elect their policy-makers by means of Plurality Voting tend to have a two-party system. This observation can be explained by the strategic behavior of voters. This article derives two broad classes of voting procedures under which strategic voting behavior induces a two-party system under standard assumptions on voter preferences. One class consists of the voting procedures with unique top-score, i.e., under which a voter can cast a top-score vote for only one candidate (e.g., Plurality Voting, Borda Count). The other class consists of the voting procedures that permit truncated ballots, i.e., under which voters do not have to cast all their votes (e.g., Approval Voting). This analysis suggests that the key for strategic voting behavior to induce a two-party system is that voters can always cast a different score for the two candidates they rank first and second on their ballots. Copyright Springer-Verlag 2013

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  • Arnaud Dellis, 2013. "The two-party system under alternative voting procedures," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 40(1), pages 263-284, January.
    • Handle: RePEc:spr:sochwe:v:40:y:2013:i:1:p:263-284
    DOI: 10.1007/s00355-011-0597-3
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    1. Francesco De Sinopoli & Giovanna Iannantuoni & Valeria Maggian & Stefania Ottone, 2018. "A Two-Party System under the Proportional Rule is Possible: Strategic Voting in the Lab," Working Papers 381, University of Milano-Bicocca, Department of Economics, revised 16 May 2018.
    2. Arnaud Dellis & Sean D’Evelyn & Katerina Sherstyuk, 2011. "Multiple votes, ballot truncation and the two-party system: an experiment," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 37(2), pages 171-200, July.
    3. Orestis Troumpounis & Dimitrios Xefteris, 2016. "Incomplete information, proportional representation and strategic voting," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 47(4), pages 879-903, December.
    4. Damien Bol & Arnaud Dellis & Mandar Oak, 2016. "Comparison of Voting Procedures Using Models of Electoral Competition with Endogenous Candidacy," Studies in Political Economy, in: Maria Gallego & Norman Schofield (ed.), The Political Economy of Social Choices, pages 21-54, Springer.
    5. Arnaud Dellis & Mandar Oak, 2016. "Multiple votes, multiple candidacies and polarization," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 46(1), pages 1-38, January.
    6. Bol, Damien & Matakos, Konstantinos & Troumpounis, Orestis & Xefteris, Dimitrios, 2019. "Electoral rules, strategic entry and polarization," Journal of Public Economics, Elsevier, vol. 178(C).

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