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On the influence of extreme parties in electoral competition with policy-motivated candidates

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  • Georges Casamatta
  • Philippe Donder

Abstract

We study and compare equilibrium platforms in models of one-dimensional electoral competition with two and four policy-motivated parties. We first analyse the plurality game, where the party that gets the most votes is elected and implements its proposed platform. Restrictions on the set of credible announcements are needed to get existence of equilibria. Comparing equilibria with two and four parties, we obtain that moderate parties react to the introduction of extreme parties by proposing the same or more extreme equilibrium platforms. We then study the proportional system, where the policy implemented is a weighted sum of the proposals, with the voting shares as weights. Here, the existence of extreme parties leads moderate ones to choose more centrist platforms.
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  • Georges Casamatta & Philippe Donder, 2005. "On the influence of extreme parties in electoral competition with policy-motivated candidates," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 25(1), pages 1-29, October.
    • Handle: RePEc:spr:sochwe:v:25:y:2005:i:1:p:1-29
    DOI: 10.1007/s00355-005-0019-5
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    1. Ignacio OrtuÓo-OrtÎn, 1997. "A spatial model of political competition and proportional representation," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 14(3), pages 427-438.
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    Cited by:

    1. Mihir Bhattacharya, 2018. "A model of electoral competition between national and regional parties," Journal of Theoretical Politics, , vol. 30(3), pages 335-357, July.
    2. repec:ebl:ecbull:v:4:y:2006:i:31:p:1-8 is not listed on IDEAS
    3. Drouvelis, Michalis & Saporiti, Alejandro & Vriend, Nicolaas J., 2014. "Political motivations and electoral competition: Equilibrium analysis and experimental evidence," Games and Economic Behavior, Elsevier, vol. 83(C), pages 86-115.
    4. Samuel Merrill & Bernard Grofman, 2019. "What are the effects of entry of new extremist parties on the policy platforms of mainstream parties?," Journal of Theoretical Politics, , vol. 31(3), pages 453-473, July.
    5. Selim Jürgen Ergun, 2015. "Centrist’S Curse? An Electoral Competition Model With Credibility Constraints," The Singapore Economic Review (SER), World Scientific Publishing Co. Pte. Ltd., vol. 60(05), pages 1-18, December.
    6. Soubeyran, Raphael, 2006. "When Inertia Generates Political Cycles," Privatisation Regulation Corporate Governance Working Papers 12192, Fondazione Eni Enrico Mattei (FEEM).
    7. Raphaël Soubeyran, 2006. "When Inertia Generates Political Cycles," Economics Bulletin, AccessEcon, vol. 4(31), pages 1-8.
    8. Machado, Fabiana, 2011. "Inequality, Uncertainty, and Redistribution," MPRA Paper 35665, University Library of Munich, Germany.

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    JEL classification:

    • D72 - Microeconomics - - Analysis of Collective Decision-Making - - - Political Processes: Rent-seeking, Lobbying, Elections, Legislatures, and Voting Behavior

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