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Moderating Political Extremism: Single Round versus Runoff Elections under Plurality Rule

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  • Massimo Bordignon
  • Tommaso Nannicini
  • Guido Tabellini

Abstract

We compare single round versus runoff elections under plurality rule, allowing for partly endogenous party formation. Under runoff elections, the number of political candidates is larger, but the influence of extremist voters on equilibrium policy, and hence policy volatility, is smaller because the bargaining power of the political extremes is reduced compared to single round elections. The predictions on the number of candidates and on policy volatility are confirmed by evidence from a regression discontinuity design in Italy, where cities above 15,000 inhabitants elect the mayor with a runoff system, while those below hold single round elections.

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  • Massimo Bordignon & Tommaso Nannicini & Guido Tabellini, 2016. "Moderating Political Extremism: Single Round versus Runoff Elections under Plurality Rule," American Economic Review, American Economic Association, vol. 106(8), pages 2349-2370, August.
    • Handle: RePEc:aea:aecrev:v:106:y:2016:i:8:p:2349-70
    Note: DOI: 10.1257/aer.20131024
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    References listed on IDEAS

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    More about this item

    JEL classification:

    • C78 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Bargaining Theory; Matching Theory
    • D72 - Microeconomics - - Analysis of Collective Decision-Making - - - Political Processes: Rent-seeking, Lobbying, Elections, Legislatures, and Voting Behavior

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