Abstract
This study aims to propose a new macropartisanship indicator under a multiparty system. Previous macropartisanship studies have focused mainly on the US two-party system. To identify macropartisanship under a multiparty system, I propose an index that considers the effective number of parties in the electoral space and the proportion of non-partisan voters, using five countries as cases: the US, the UK, Japan, Germany, and Denmark. Further, a brief examination using fractional integration shows that the newly defined macropartisanship in two-party systems is more stable than in multiparty systems, where macropartisanship has more frequent updates.
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