Our paper addresses firm size as a driver of systematic credit risk in loans to small and medium enterprises (SMEs). Key contributions are the use of a unique data set of SME lending by over 400 German banks and relating systematic risk to the size dependence of regulatory capital requirements....

Credit Risk Measurement in the Context of Basel II -- Concentration Risk in Credit Portfolios and Its Treatment Under Basel II -- Model-Based Measurement of Name Concentration Risk in Credit Portfolios -- Model-Based Measurement of Sector Concentration Risk in Credit Portfolios -- Conclusion