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On the Influence of Extreme Parties in Electoral Competition with Policy-Motivated Candidates

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  • Casamatta, Georges
  • De Donder, Philippe

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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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 3885.

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Date of creation: May 2003
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Handle: RePEc:cpr:ceprdp:3885

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Keywords: electoral competition; plurality rule; proportional system;

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  1. Martin J. Osborne, 1992. "Candidate Positioning and Entry in a Political Competition," Department of Economics Working Papers 1992-02, McMaster University.
  2. Palfrey, Thomas R, 1984. "Spatial Equilibrium with Entry," Review of Economic Studies, Wiley Blackwell, vol. 51(1), pages 139-56, January.
  3. Ignacio OrtuÓo-OrtÎn, 1997. "A spatial model of political competition and proportional representation," Social Choice and Welfare, Springer, vol. 14(3), pages 427-438.
  4. Enriqueta Aragonés & Andrew Postlewaite, 2000. "Campaign rhetoric: A model of reputation," Economics Working Papers 525, Department of Economics and Business, Universitat Pompeu Fabra.
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Cited by:
  1. Selim Ergun, 2008. "Centrist's Curse? An Electoral Competition Model with Credibility Constraints," ThE Papers 08/06, Department of Economic Theory and Economic History of the University of Granada..
  2. Michalis Drouvelis & Alejandro Saporiti & Nicolaas J. Vriend, 2011. "Political Motivations and Electoral Competition: Equilibrium Analysis and Experimental Evidence," The School of Economics Discussion Paper Series 1119, Economics, The University of Manchester.
  3. Machado, Fabiana, 2011. "Inequality, Uncertainty, and Redistribution," MPRA Paper 35665, University Library of Munich, Germany.
  4. Raphaël Soubeyran, 2006. "When Inertia Generates Political Cycles," Economics Bulletin, AccessEcon, vol. 4(31), pages 1-8.
  5. repec:ebl:ecbull:v:4:y:2006:i:31:p:1-8 is not listed on IDEAS

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