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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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File URL: http://www.socialsciences.manchester.ac.uk/medialibrary/economics/discussionpapers/EDP-1301.pdf
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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
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Handle: RePEc:man:sespap:1301
Contact details of provider: Postal: Manchester M13 9PL
Phone: (0)161 275 4868
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Web page: http://www.socialsciences.manchester.ac.uk/subjects/economics/

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  1. Humberto Llavador, 2006. "Electoral Platforms, Implemented Policies, and Abstention," Social Choice and Welfare, Springer, vol. 27(1), pages 55-81, August.
  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. 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.
  4. 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.
  5. Nicolas Sahuguet & Nicola Persico, 2006. "Campaign spending regulation in a model of redistributive politics," Economic Theory, Springer, vol. 28(1), pages 95-124, 05.
  6. 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.
  7. 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.
  8. Bagnoli, M. & Bergstrom, T., 1989. "Log-Concave Probability And Its Applications," Papers 89-23, Michigan - Center for Research on Economic & Social Theory.
  9. Faravelli, Marco & Sanchez-Pages, Santiago, 2012. "(Don’t) Make My Vote Count," SIRE Discussion Papers 2012-07, Scottish Institute for Research in Economics (SIRE).
    • Santiago Sanchez-Pages (University of Edinburgh) & Marco Faravelli (School of Economics, University of Queensland, Australia), 2012. "(Don't) Make My Vote Count," ESE Discussion Papers 213, Edinburgh School of Economics, University of Edinburgh.
  10. Nicola Persico & Alessandro Lizzeri, 2001. "The Provision of Public Goods under Alternative Electoral Incentives," American Economic Review, American Economic Association, vol. 91(1), pages 225-239, March.
  11. Carmona, Guilherme, 2009. "An existence result for discontinuous games," Journal of Economic Theory, Elsevier, vol. 144(3), pages 1333-1340, May.
  12. DE SINOPOLI, Francesco & IANNANTUONI, Giovanna, 2000. "A spatial voting model where proportional rule leads to two-party equilibria," CORE Discussion Papers 2000037, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  13. 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.
  14. 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.
  15. Pavlo Prokopovych, 2013. "The single deviation property in games with discontinuous payoffs," Economic Theory, Springer, vol. 53(2), pages 383-402, June.
  16. 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.
  17. Nicola Persico & José Carlos Rodríguez-Pueblita & Dan Silverman, 2007. "Factions and Political Competition," NBER Working Papers 13008, National Bureau of Economic Research, Inc.
  18. Erik Balder, 2011. "An equilibrium closure result for discontinuous games," Economic Theory, Springer, vol. 48(1), pages 47-65, September.
  19. 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.
  20. Herrera, Helios; Morelli, Massimo, 2010. "Turnout and Power Sharing," Economics Working Papers ECO2010/12, European University Institute.
  21. Pavlo Prokopovych, 2011. "On equilibrium existence in payoff secure games," Economic Theory, Springer, vol. 48(1), pages 5-16, September.
  22. repec:hal:journl:halshs-00426402 is not listed on IDEAS
  23. 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.
  24. Guilherme Carmona, 2011. "Understanding some recent existence results for discontinuous games," Economic Theory, Springer, vol. 48(1), pages 31-45, September.
  25. Guilherme Carmona, 2011. "Symposium on: Existence of Nash equilibria in discontinuous games," Economic Theory, Springer, vol. 48(1), pages 1-4, September.
  26. 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.
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