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date: 09 December 2018

Abstract and Keywords

The diffusion of mixed-member electoral systems over the last three decades has prompted extensive scholarly attention to their consequences. One approach, labeled controlled comparison, emphasizes how the juxtaposition of two different election rules allows scholars to assess the implications of Duverger’s propositions. Another approach, labeled contamination effects, emphasizes how the simultaneous use of two different election rules creates interaction that potentially undermines the implications of Duverger’s propositions. The literature building upon these two approaches is inconclusive; some research finds evidence of contamination effects and other research does not. This chapter strives to reconcile the two approaches and proposes a research agenda that could uncover why scholarship on mixed-member systems has not reached consensus on their consequences.

Keywords: election rules, mixed-member electoral systems, mixed-member proportional (MMP), mixed-member majoritarian (MMM), contamination, controlled comparison, Duverger’s law

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