Parties' Policy Programmes and the Dog that Didn't Bark: No Evidence that Proportional Systems Promote Extreme Party Positioning

Lawrence Ezrow

British Journal of Political Science, 2008, vol. 38, issue 3, 479-497

Abstract: There is extensive theoretical research that explores the linkages between parties' policy positions, on the one hand, and the characteristics of the political system (i.e. voting rules and the number of parties) on the other, but empirical research on this topic is less developed. Building on earlier work by Jay Dow, this article reports empirical analyses exploring the connections between the average party policy extremism in fifteen party systems (defined as the average party policy distance from the party system centre), and two important system-level variables: the proportionality of the electoral laws used to select representatives to the national legislature, and the number of political parties. Contrary to expectations – but consistent with recent theoretical work by Norman Schofield and his co-authors – no evidence is found that average party policy extremism increases under proportional representation, nor that policy extremism increases in countries that feature large numbers of parties. These findings have important implications for political representation and for understanding parties' election strategies.

Date: 2008
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