Income inequality and party (de)polarisation

Abstract

Scholars of US politics report a strong connection between income inequality and party polarisation. This study evaluates this relationship comparatively, and finds that the opposite association holds outside the United States, namely, that increasing inequality depolarises political parties’ economic positions. High levels of inequality change the composition of the core constituencies on the left and depress the participation of low-income voters, leaving left-wing parties with less support when they adopt distinct leftward positions. At the same time, inequality does not create strong incentives for right-wing parties to move further rightward. Therefore, income inequality leads to party systems that are depolarised on economic issues. The results have implications for our understanding of political representation, economic inequality, and political polarisation.