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Coalition and Party Formation in a Legislative Voting Game

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  • Jackson, Matthew O.
  • Moselle, Boaz

Abstract

We examine a legislative voting game where decisions are being made over both ideological and distributive dimensions, and legislators' preferences are separable over the two dimensions. In equilibrium legislators prefer to make proposals for the two dimensions together, rather than offering sequential proposals on the two dimensions separately. The equilibria exhibit interaction between the ideological and distributive dimensions and in any equilibrium there is a positive probability that a proposal is made and approved which excludes the median legislator (as defined over the ideological dimension), in contrast with a game where no distributive decision is being made. Moreover, in any stationary equilibrium there is more than one ideological decision that has a positive probability of being proposed and approved. We show that legislators can gain from forming political parties, and consider examples where predictions can be made about the composition of parties. We discuss the impact of political parties on the outcome.

Suggested Citation

  • Jackson, Matthew O. & Moselle, Boaz, 1998. "Coalition and Party Formation in a Legislative Voting Game," Working Papers 1036, California Institute of Technology, Division of the Humanities and Social Sciences.
    • Handle: RePEc:clt:sswopa:1036
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    1. repec:cup:apsrev:v:83:y:1989:i:04:p:1181-1206_08 is not listed on IDEAS
    2. repec:cup:apsrev:v:85:y:1991:i:01:p:137-164_17 is not listed on IDEAS
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    5. Austen-Smith, David & Banks, Jeffrey, 1988. "Elections, Coalitions, and Legislative Outcomes," American Political Science Review, Cambridge University Press, vol. 82(02), pages 405-422, June.
    6. Harrington, Joseph Jr., 1989. "The advantageous nature of risk aversion in a three-player bargaining game where acceptance of a proposal requires a simple majority," Economics Letters, Elsevier, vol. 30(3), pages 195-200, September.
    7. Brams, S.J. & Jones, M.A. & Kilgour, D.M., 1999. "The Paradox of Disconnected Coalitions," Working Papers 99-19, C.V. Starr Center for Applied Economics, New York University.
    8. Harrington, Joseph E, Jr, 1990. "The Power of the Proposal Maker in a Model of Endogenous Agenda Formation," Public Choice, Springer, vol. 64(1), pages 1-20, January.
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