DEMOCRATIC INSTITUTIONS AND REGIME SURVIVAL: Parliamentary and Presidential Democracies Reconsidered

We review arguments and empirical evidence found in the comparative literature that bear on the differences in the survival rates of parliamentary and presidential democracies. Most of these arguments focus on the fact that presidential democracies are based on the separation of executive and legislative powers, while parliamentary democracies are based on the fusion of these powers. From this basic distinction several implications are derived which would lead to radically different behavior and outcomes under each regime. We argue that this perspective is misguided and that we cannot deduce the functioning of the political system from the way governments are formed. There are other provisions, constitutional or otherwise, that also affect the way parliamentary and presidential democracies operate and that may counteract some of the tendencies that we would expect to observe if we were to derive the regime’s performance from its basic constitutional principle.