The European Council's decisions to implement the De Larosiere recommendations for a reformed approach to micro-level financial supervision and a new European Systemic Risk Board (ESRB) are to be welcomed. The ECB's central role in the ESRB is also to be welcomed. However, the limited role...

This paper studies leverage regulation and monetary policy when equity investors and/or creditors have distorted beliefs relative to a planner. We characterize how the optimal leverage regulation responds to arbitrary changes in investors' and creditors' beliefs and relate our results to...