Theory predicts that "common ownership" (ownership of rivals by a common shareholder) can be anticompetitive because it reduces the weight firms place on their own profits and shifts weight toward rival firms held by common shareholders. In this paper we use accounting data from the banking...

New bank formation in the U.S. has declined dramatically since the financial crisis, from well over 100 new banks per year to less than 1. Many have suggested that this is due to newly-instituted regulation, but the current weak economy and low interest rates (which both depress banking profits)...