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

  • Massimo Bordignon
  • Guido Tabellini

We compare single ballot vs dual ballot elections under plurality rule, assuming sincere voting and allowing for partly endogenous party formation. Under the dual ballot, the number of parties is larger but the influence of extremist voters on equilibrium policy is smaller, because their bargaining power is reduced compared to a single ballot election. The predictions on the number of parties and on policy volatility are consistent with data on municipal elections in Italy, where cities with more (less) than 15,000 inhabitants have dual (single) ballots respectively.

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Paper provided by CESifo Group Munich in its series CESifo Working Paper Series with number 2600.

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Date of creation: 2009
Date of revision:
Handle: RePEc:ces:ceswps:_2600
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  1. Roger B. Myerson & Robert J. Weber, 1988. "A Theory of Voting Equilibria," Discussion Papers 782, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
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  19. David P. Myatt, 2004. "On the Theory of Strategic Voting," Economics Series Working Papers 186, University of Oxford, Department of Economics.
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