We develop a dynamic general equilibrium model of capital accumulation where credit is intermediated by banks operating in a Cournot oligopoly. The number of banks affects capital accumulation through two channels. First, it affects the quantity of credit available to entrepreneurs. Second, it...

We document the build-up of regulatory and market equity capital in large U.S. bank holding companies between 1986 and 2000. During this time, large banking firms raised their capital ratios to the highest levels in more than 50 years. Since 1995, essentially none of the 100 largest U.S. banking...