Ben is joined by Professor Matthew Shugart from UC Davis to discuss how the electoral system influences the party system. We discuss the effective number of parties measure, and the seat product model, which uses the size of the parliamentary assembly and the district magnitude to predict the shape of the party system in each country.
- The SPM is explained most simply in this journal article.
- Or you can check out Votes From Seats, which explains it in more detail.
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