Explaining political decentralization in parliamentary democracies

This article explores the determinants of political decentralization in 29 OECD parliamentary democracies. I examine how the decision to enact political decentralization is mediated by the partisan composition of parliamentary governments. Specifically, I hypothesize that four features impact the ability and motive to institute political decentralization: government ideology, policy decentralization platforms, power and stability, and the presence of ethnoregionalist parties in the national legislature and as government members. Empirical results reveal that ideology and policy platforms play little role in the decision to enact political reform. However, there is strong evidence that powerful and stable governments and the rise of ethnoregionalist parties in national politics substantially increase the probability of political decentralization. Government composition plays a significant role in institutional change and should be considered in future models on the determinants of decentralization.