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Divergent Platforms

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  • Sophie Bade

    (Max Planck Institute for Research on Collective Goods, Bonn)

Abstract

A robust feature of models of electoral competition between two opportunistic, purely office-motivated parties is that both parties become indistinguishable in equilibrium. I this short note, I show that this strong connection between the office motivation of parties and their equilibrium choice of identical platforms depends on the following two - possibly counterfactual - assumptions: 1. Issue spaces are uni-dimensional and 2. Parties are unitary actors whose preferences can be represented by expected utility functions. The main goal here is to provide an example of a two-party model in which parties offer substantially different platforms in equilibrium even though no exogenous asymmetries are assumed. In this example, some voters’ preferences over the 2-dimensional issue space are assumed to exhibit non-convexities and parties evaluate their actions with respect to a set of beliefs on the electorate.

Suggested Citation

  • Sophie Bade, 2011. "Divergent Platforms," Discussion Paper Series of the Max Planck Institute for Research on Collective Goods 2011_25, Max Planck Institute for Research on Collective Goods.
    • Handle: RePEc:mpg:wpaper:2011_25
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    File URL: http://www.coll.mpg.de/pdf_dat/2011_25online.pdf
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    References listed on IDEAS

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    1. Cerreia-Vioglio, S. & Maccheroni, F. & Marinacci, M. & Montrucchio, L., 2011. "Uncertainty averse preferences," Journal of Economic Theory, Elsevier, vol. 146(4), pages 1275-1330, July.
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    3. Brusco, Sandro & Dziubiński, Marcin & Roy, Jaideep, 2012. "The Hotelling–Downs model with runoff voting," Games and Economic Behavior, Elsevier, vol. 74(2), pages 447-469.
    4. Wittman, Donald A., 1973. "Parties as Utility Maximizers," American Political Science Review, Cambridge University Press, vol. 67(2), pages 490-498, June.
    5. Schmeidler, David, 1989. "Subjective Probability and Expected Utility without Additivity," Econometrica, Econometric Society, vol. 57(3), pages 571-587, May.
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    Full references (including those not matched with items on IDEAS)

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    More about this item

    Keywords

    Downs model; Games with Incomplete Preferences; Knightian Uncertainty; Uncertainty Aversion; Platform Divergence;
    All these keywords.

    JEL classification:

    • D81 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Criteria for Decision-Making under Risk and Uncertainty
    • D72 - Microeconomics - - Analysis of Collective Decision-Making - - - Political Processes: Rent-seeking, Lobbying, Elections, Legislatures, and Voting Behavior
    • C79 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Other

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