During the last thirty years, U.S. bank concentration has been growing over time, as has bank capital ratio, which has been rising and already well above the minimum capital requirement. To explain these findings, I develop a tractable dynamic model with two key elements: financial constrained...

In the past several decades, the U.S. economy has witnessed a number of striking trends that indicate a rising market concentration and a slowdown in business dynamism. In this paper, we make an attempt to understand potential common forces behind these empirical regularities through the lens of...

We develop a dynamic model with time variation in external equity financing costs and show that variation in these costs is important for the model to quantitatively capture the joint dynamics of firms' asset prices, real quantities, and financial flows in the U.S. economy. Growth firms and high...