Abstract
This article draws on a comprehensive data set from the 1993-1999 Russian regional legislative elections to estimate the consequences of different plurality or majority rules, as well as their combinations with proportional representation (PR), for party formation in the country. The results of multiple regression analysis indicate that the system of single-member plurality does not support party formation. Mixed electoral systems involve PR support parties in two ways: first, mechanically, by excluding independents from party list competition, and second, as a result of contamination effects across these systems' components. Counterintuitively, the analysis reveals that the systems of multimember plurality and two-round majority tend to be relatively supportive of party formation. The article explains this phenomenon by developing a model that incorporates these systems' ability to set lower effective thresholds and to enhance the information value of party labels, thus facilitating the entry of party candidates and their electoral success.
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