Published online by Cambridge University Press: 15 July 2019
The concept of electoral competition plays a central role in many subfields of political science, but no consensus exists on how to measure it. One key challenge is how to conceptualize and measure electoral competitiveness at the district level across alternative electoral systems. Recent efforts to meet this challenge have introduced general measures of competitiveness which rest on explicit calculations about how votes translate into seats, but also implicit assumptions about how effort maps into votes (and how costly effort is). We investigate how assumptions about the effort-to-votes mapping affect the units in which competitiveness is best measured, arguing in favor of vote-share-denominated measures and against vote-share-per-seat measures. Whether elections under multimember proportional representation systems are judged more or less competitive than single-member plurality or runoff elections depends directly on the units in which competitiveness is assessed (and hence on assumptions about how effort maps into votes).
Authors’ note: We thank Georgina Evans for research assistance, Royce Carroll, Olle Folke, Torben Iversen, Mark Kayser, Vincent Pons, Chi-lin Tsai, Janne Tukiainen, referees, and audience participants at the European Political Science Association meeting, Southern Political Science Association meeting, and UCSD for helpful comments, and Peter Selb for kindly sharing his replication data and codes. Replication materials for this article are available at the Political Analysis Dataverse as Cox, Fiva, and Smith (2019b).
Contributing Editor: Lonna Atkeson
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