Measuring Presidential and Prime Ministerial Power
The power of the executive is central to any understanding of politics. For those working in the tradition of comparative politics, the successful measurement of executive power is necessary to test our theories and push the discipline forward. Yet no clear consensus exists as to exactly how we should measure executive power. The purpose of this chapter is to provide some synthesis to the large amount of work that measures either presidential or prime ministerial power. After discussing the importance of executive power and considering the conceptual clarity of such measures, the chapter surveys existing measures of executive power from presidents to prime ministers. It highlights the divergence between measures of executive power in presidential systems in comparison to measures of executive power in parliamentary systems. Part of this divergence stems from the different sources of executive power for presidents, where power is rooted in constitutions, compared with prime ministers, where power is largely relational. There is also disagreement about the nature of power within regime types however. The chapter concludes by considering the future research agenda.