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A Spatial Voting Model Where Proportional Rule Leads to Two-Party Equilibria

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  • Francesco De Sinopoli

    ()
    (Universidad Carlos III de Madrid - Department of Economics)

  • Giovanna Iannantuoni

    ()
    (Universidad Carlos III de Madrid - Department of Economics)

Abstract

n this paper we show that in a simple spatial model where the government is chosen under strict proportional rule, if the outcome function is a linear combination of parties' positions, with coefficient equal to their share of votes, essentially only a two-party equilibrium exists. The two parties taking a positive number of votes are the two extremist ones. Applications of this result include an extension of the well-known Alesina and Rosenthal model of divided government as well as a modified version of Besley and Coate's model of representative democracy. Different outcome functions are then analyzed.

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Bibliographic Info

Paper provided by Tor Vergata University, CEIS in its series CEIS Research Paper with number 31.

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Length: 26
Date of creation: 01 Aug 2003
Date of revision:
Handle: RePEc:rtv:ceisrp:31

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Postal: CEIS - Centre for Economic and International Studies - Faculty of Economics - University of Rome "Tor Vergata" - Via Columbia, 2 00133 Roma
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Related research

Keywords: Voting; Proportional Rule; Nash Equilibria;

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References

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  1. Ignacio OrtuÓo-OrtÎn, 1997. "A spatial model of political competition and proportional representation," Social Choice and Welfare, Springer, vol. 14(3), pages 427-438.
  2. Grossman, G-M & Helpman, E, 1996. "Competing for Endorsements," Papers 182, Princeton, Woodrow Wilson School - Public and International Affairs.
  3. Roger B. Myerson & Robert J. Weber, 1988. "A Theory of Voting Equilibria," Discussion Papers 782, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  4. Austen-Smith, David & Banks, Jeffrey., 1987. "Elections, Coalitions, and Legislative Outcomes," Working Papers 643, California Institute of Technology, Division of the Humanities and Social Sciences.
  5. Alesina, Alberto & Rosenthal, Howard, 2000. "Polarized platforms and moderate policies with checks and balances," Journal of Public Economics, Elsevier, vol. 75(1), pages 1-20, January.
  6. Francesco De Sinopoli, 2000. "Sophisticated voting and equilibrium refinements under plurality rule," Social Choice and Welfare, Springer, vol. 17(4), pages 655-672.
  7. Tim Besley & Stephen Coate, . ""An Economic Model of Representative Democracy''," CARESS Working Papres 95-02, University of Pennsylvania Center for Analytic Research and Economics in the Social Sciences.
  8. Alesina, Alberto & Rosenthal, Howard, 1996. "A Theory of Divided Government," Econometrica, Econometric Society, vol. 64(6), pages 1311-41, November.
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