The Impact of Proportional Representation on Turnout: Evidence from New Zealand

Abstract

Theories of voter turnout assume that institutional arrangements can alter incentives for participation. Countries with proportional representation (PR) are assumed to increase the incentives to participate because they reduce the proportion of votes that are wasted, giving voters a stronger incentive to participate and parties a stronger incentive to mobilise voters. This paper departs from previous cross-national studies by employing individual-level data during a transition between electoral systems in one country. We used survey data collected before and after electoral reform in New Zealand to examine patterns of participation among political minorities. As a direct test of individual change, the analysis was supplemented with survey data from the last election held under first past the post (FPP) merged with validated participation data from the following election held under PR. We found that the adoption of PR in New Zealand has succeeded initially in fostering more positive attitudes about the efficacy of voting. In New Zealand's first election held under PR, voters who were on the extreme left were significantly more likely to participate than previously, leading to an overall increase in turnout.