The German financial system is characterized by lower degrees of penetration by foreign commercial banks and of (bank) disintermedation than, for instance, that of the United States. These differences between the two countries could be attributed to the fact that universal banking in Germany...

Does the mere presence of big banks affect macroeconomic outcomes? In this paper, we develop a theory of granularity (Gabaix, 2011) for the banking sector, introducing Bertrand competition and heterogeneous banks charging variable markups. Using this framework, we show conditions under which...

Does the mere presence of big banks affect macroeconomic outcomes? Gabaix (2011) shows that idosyncratic shocks can have aggregate effects if the distribution of firm sizes in manufacturing follows a power law distribution. Our contribution is two-fold. First, we expand the theory of granularity...

We examine variation in US hospital quality across ownership, market concentration and membership of a hospital chain. We use a new measure of quality derived from the penalties imposed on hospitals under the flagship Hospital Readmissions Reduction Program. We document a robust and sizable...