Two-ballot versus plurality rule: an empirical investigation on the number of candidates
AbstractDuverger claimed more than 50 years ago that the number of candidates in elections should be a function of electoral rules. Both his “law” and “hypothesis” suggest the number of candidates vying for seats in elections to be tightly linked to characteristics of the electoral process such as its degree of proportionality and the presence of runoffs. Here we test the validity of Duverger’s claim using data from municipal elections in Brazil. Our study differs from others in the field in two important dimensions. First, by using municipal data we avoid the usual problems that plague statistical analysis using cross-country data. Secondly, we have a truly exogenous source of variation due to a change in electoral legislation introduced by the constitutional reform of 1988: simple plurality remained the rule only in municipalities with less than 200,000 voters, and a second-ballot became mandatory for the others above that threshold. This allows for a neat identification strategy using panel data. Our main finding is that elections with runoffs lure greater numbers of candidates in municipalities with sufficiently high levels of heterogeneity.
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Bibliographic InfoPaper provided by Universidade Federal do Paraná, Department of Economics in its series Working Papers with number 0112.
Length: 16 pages
Date of creation: 2011
Date of revision:
Note: Creation Date corresponds to the year in which the paper was published on the Department of Economics website. The paper may have been written a small number of months before its publication date.
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Duverger's law; runoff; heterogeneity;
Other versions of this item:
- Carlos Gonçalves & Ricardo Madeira & Mauro Rodrigues, 2008. "Two-ballot versus plurality rule: an empirical investigation on the number of candidates," Working Papers 09_10, Universidade de São Paulo, Faculdade de Economia, Administração e Contabilidade de Ribeirão Preto.
- D70 - Microeconomics - - Analysis of Collective Decision-Making - - - General
- D72 - Microeconomics - - Analysis of Collective Decision-Making - - - Political Processes: Rent-seeking, Lobbying, Elections, Legislatures, and Voting Behavior
This paper has been announced in the following NEP Reports:
- NEP-ALL-2011-07-13 (All new papers)
- NEP-CDM-2011-07-13 (Collective Decision-Making)
- NEP-POL-2011-07-13 (Positive Political Economics)
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- Laurent Bouton, 2012.
"A Theory of Strategic Voting in Runoff Elections,"
Boston University - Department of Economics - Working Papers Series
WP2012-001, Boston University - Department of Economics.
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