Principal–agent analyses have been frequently applied by scholars of the European Union (EU). The model helps to explain the reasons, modalities, and consequences of the delegation of authority from one (set of) actor(s)—the principal—to another (set of) actor(s)—the agent. Instances of delegation are omnipresent in the EU: not only is the EU founded upon the delegation of rule-making powers from the member states to the supranational level (European integration), but delegation is also frequently occurring from one actor or institution to another within the political system of the EU (EU decision-making). Assuming that institutions are forums for strategic behavior by rational actors, the principal–agent model has advanced our understandin...