Abstract

This chapter focuses on liberal intergovernmentalism (LI), which has acquired the status of a ‘baseline theory’ in the study of regional integration: an essential first-cut explanation against which other theories are often compared. The chapter argues that LI has achieved this dominant status due to its theoretical soundness, empirical power, and utility as a foundation for synthesis with other explanations. After providing an overview of LI’s main assumptions and propositions, the chapter illustrates LI’s scope and empirical power with two recent cases: migration policy and the euro. It closes by considering common criticisms levelled against LI, as well as the scope conditions under which it is most likely to explain state behaviour. This chapter concludes by emphasizing LI’s openness to dialogue and synthesis with other theories and reiterating its status as a baseline theory of European integration.