Chapter 1 introduces the reader to macro-prudential policy and exposes the reader to the problem of persistently instable financial markets, which raise the question of if and how far the macro-prudential regulatory program post-crisis had any effect. In contrast to binary paradigm shift views, which see no to little change, I introduce a multidimensional view of regulatory change that can detect massive change in the economic ideas underlying financial regulation, while pointing to the administrative and political limitations that prevent these ideas from becoming fully performative. Pointing to these contradictions, the chapter introduces the analytical framework and the main contributions of the book, followed by an outline of the different chapters.