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Power Sharing and Electoral Equilibrium

  • Alejandro Saporiti

This paper considers a model of (consensual) democracy where political parties engage first in electoral competition, and they share policy-making power afterward according with the votes gathered in the election. The paper uncovers the difficulties to guarantee stability in this institutional setting; and it provides a condition of symmetry on parties’ political motivations that ensures the existence of pure strategy equilibrium under a broad family of power sharing rules, ranging from fully proportional to winner-take-all. The equilibrium analysis shows that power sharing and ideology exert a centrifugal force on policy platforms that increases party polarization, with the paradoxical result that consensual democracies can actually lead to more radical electoral campaigns than winner-take-all. Copyright Springer-Verlag Berlin Heidelberg 2014

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Paper provided by Economics, The University of Manchester in its series The School of Economics Discussion Paper Series with number 1301.

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Date of creation: 2013
Date of revision:
Handle: RePEc:man:sespap:1301
Contact details of provider: Postal: Manchester M13 9PL
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  1. Michalis Drouvelis & Alejandro Saporiti & Nicolaas J. Vriend, 2011. "Political Motivations and Electoral Competition: Equilibrium Analysis and Experimental Evidence," Working Papers 682, Queen Mary University of London, School of Economics and Finance.
  2. Alejandro Saporiti, 2007. "Existence and uniqueness of Nash equilibrium in electoral competition games: The hybrid case," Wallis Working Papers WP50, University of Rochester - Wallis Institute of Political Economy.
  3. Nicola Persico & José Carlos Rodríguez-Pueblita & Dan Silverman, 2007. "Factions and Political Competition," NBER Working Papers 13008, National Bureau of Economic Research, Inc.
  4. Humberto Llavador, 2003. "Electoral Platforms, Implemented Policies, and Abstention," Working Papers 34, Barcelona Graduate School of Economics.
  5. Francesco De Sinopoli & Giovanna Iannantuoni, 2003. "A Spatial Voting Model Where Proportional Rule Leads to Two-Party Equilibria," CEIS Research Paper 31, Tor Vergata University, CEIS.
  6. Pavlo Prokopovych, 2011. "On equilibrium existence in payoff secure games," Economic Theory, Springer, vol. 48(1), pages 5-16, September.
  7. Herrera, Helios; Morelli, Massimo, 2010. "Turnout and Power Sharing," Economics Working Papers ECO2010/12, European University Institute.
  8. Paulo Barelli & Idione Meneghel, 2013. "A Note on the Equilibrium Existence Problem in Discontinuous Games," Econometrica, Econometric Society, vol. 81(2), pages 813-824, 03.
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  10. Samuel Merrill & James Adams, 2007. "The effects of alternative power-sharing arrangements: Do “moderating” institutions moderate party strategies and government policy outputs?," Public Choice, Springer, vol. 131(3), pages 413-434, June.
  11. Faravelli, Marco & Sanchez-Pages, Santiago, 2012. "(Don’t) Make My Vote Count," SIRE Discussion Papers 2012-07, Scottish Institute for Research in Economics (SIRE).
  12. Guilherme Carmona, 2011. "Understanding some recent existence results for discontinuous games," Economic Theory, Springer, vol. 48(1), pages 31-45, September.
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  14. Oriol Carbonell-Nicolau & Richard McLean, 2012. "Approximation Results for Discontinuous Games with an Application to Equilibrium Refinement," Departmental Working Papers 201206, Rutgers University, Department of Economics.
  15. Pavlo Prokopovych, 2013. "The single deviation property in games with discontinuous payoffs," Economic Theory, Springer, vol. 53(2), pages 383-402, June.
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  18. Alessro Lizzeri & Nicola Persico, . "The Provision of Public Goods Under Alternative Electoral Incentives," Penn CARESS Working Papers b96440ba0bfa06ca550ac40aa, Penn Economics Department.
  19. Philippe Bich, 2009. "Existence of pure Nash equilibria in discontinuous and non quasiconcave games," Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) halshs-00426402, HAL.
  20. Philip J. Reny, 1999. "On the Existence of Pure and Mixed Strategy Nash Equilibria in Discontinuous Games," Econometrica, Econometric Society, vol. 67(5), pages 1029-1056, September.
  21. Luciano I. de Castro, 2008. "Equilibria Existence in Regular Discontinuous Games," Discussion Papers 1463, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
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  23. Richard Ball, 1999. "Discontinuity and non-existence of equilibrium in the probabilistic spatial voting model," Social Choice and Welfare, Springer, vol. 16(4), pages 533-555.
  24. repec:hal:journl:halshs-00426402 is not listed on IDEAS
  25. Philippe Bich, 2009. "Existence of pure Nash equilibria in discontinuous and non quasiconcave games," Documents de travail du Centre d'Economie de la Sorbonne 09061, Université Panthéon-Sorbonne (Paris 1), Centre d'Economie de la Sorbonne.
  26. Adib Bagh & Alejandro Jofre, 2006. "Reciprocal Upper Semicontinuity and Better Reply Secure Games: A Comment," Econometrica, Econometric Society, vol. 74(6), pages 1715-1721, November.
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