States and banks have traditionally maintained close ties. At various points in time, states have used banks to manage their economies and soak up government debt, while banks enjoyed regulatory forbearance, restricted competition, and implicit or explicit guarantees from their home markets. The political foundations of banks have thus been powerful and enduring, with actors on both sides of the aisle reluctant to sever relations.

The central argument of this book, however, is that in the world's largest integrated market, Europe, the traditional political ties between states and banks...