It has been argued that competing banks make inefficiently frequent use of collateralization in situations where they are better able to evaluate a project's risk than entrepreneurs. We study the bank's choice between screening and collateralization in a model where banks do not have this...

We study the effects of competition on loan rates and portfolio-at-risk in microcredit markets using a new database from rating agencies, covering 379 microbanks located in 67 countries between 2002 and 2008. Our study reveals different competitive effects in nonprofit and for-profit microbanks....

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...