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, Volume 164, Issue 1–2, pp 117–133 | Cite as

Keeping the party together

  • Hande Mutlu-ErenEmail author
Article

Abstract

Under what conditions do political parties split? This paper presents a model of intra-party politics to explain party unity in parliamentary systems. The theory derived from an incomplete information game predicts that parties split with positive probability, which rises with the cost of dissent following a failed attempt to split and falls with the cost of forming a new party. Party unity also is predicted to be high when the leadership faction’s weight within the party is large. The model’s results have implications for the relationship between party unity and the majority status of the government party, party system polarization as well as intra-party polarization.

Keywords

Party split Intra-party dynamics Party factions Party formation Perfect Bayesian equilibria 

Notes

Acknowledgments

I am grateful to Michael Laver, Torun Dewan, Steven Brams, David Stasavage, Kanchan Chandra, and the anonymous referees for extremely helpful comments. A previous version of this manuscript was presented at the 2011 Annual Meeting of the European Political Science Association, Dublin.

Supplementary material

11127_2015_277_MOESM1_ESM.pdf (87 kb)
Supplementary material 1 (pdf 87 KB)

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of PoliticsNew York UniversityNew YorkUSA

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