The European Union's banking union project started in mid-2012 in response to the euro-area crisis, with the goal of breaking the bank-sovereign vicious circle. The objective was also to restore private liability in banking and to move towards an integrated supranational market for banking...

Following the June 2012 European Council decision to place the ‘Single Supervisory Mechanism' (SSM) within the European Central Bank, the general presumption in the policy discussions has been that there should be ‘Chinese walls' between the supervisory and monetary policy arms of the ECB....

This paper analyzes the distortions that banks' cross-border activities, such as foreign assets, deposits and equity, can introduce into regulatory interventions. We find that while each individual dimension of cross-border activities distorts the incentives of a domestic regulator, a balanced...