“…While recent works, such as Robinson and Torvik (2008) and Hayo and Voigt (2013), investigate the determinants of the choice or change of the constitutional structure, not much has been done to refine the classification of constitutional structures when studying their effect on policy. 3 In Section 2 we suggest how our findings may be explained by two effects that are consistent with previous theoretical literature: a selection effect, as in Cella et al (2015), and a legislative cohesion effect, as in Baron (1998), Feddersen (1998a, 1998b) and Diermeier and Vlaicu (2011). Section 3 presents the data and the model, Section 4 discusses the results and Section 5 concludes.…”