"We use bank stock returns to develop an ex-ante measure of the distortion created by the implicit collective guarantee extended to large U.S. financial institutions. The average return on a stock portfolio that goes long in the largest U.S. commercial banks and short in the smallest banks is...

U.S. banks have increasingly diversified into activities traditionally considered as non-core for the banking sector. This paper investigates whether diversification influences banks' investment (credit) policy and profitability. Diversified banks appear to benefit from “coinsurance,” supply...

The largest commercial bank stocks, ranked by the total size of the balance sheet, have significantly lower risk-adjusted returns than small- and medium-sized bank stocks, even though large banks are significantly more levered. We uncover a size factor in the component of bank returns that is...