Internal ratings-based models are used for a variety of important bank and regulatory decisions. Thus, model risk – the potential for different models to provide different probability-of-default (PD) estimates – is of crucial importance. Using a comprehensive dataset from 40 banks and 17,000...

Our paper addresses firm size as a driver of systematic credit risk in loans to small and medium-sized 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...

Using a unique and comprehensive data set on the two largest economies of the Eurozone - France and Germany - this paper first proceeds to a computation of the Gordy formula relaxing the ad hoc sizedependent constraints of the Basel formulas. Our study contributes to Article 501 of the Capital...

In the last decade, stress tests have become indispensable in bank risk management which has led to significantly increased requirements for stress tests for banks and regulators. Although the complexity of stress testing frameworks has been enhanced considerably over the course of the last few...

We develop a macroeconomic portfolio stress test that is specifically geared towards small and medium-sized banks. We combine a credit risk stress test which simulates credit impairments via a CreditMetrics type multi-factor portfolio model with an income stress test in the form of dynamic panel...

German savers are renowned for preferring safe, long-term investments, thus providing patient capital, with bank deposits playing an important role. Using a comprehensive data set for the German banking sector, we examine whether German depositors are really that patient, abstaining from any...

Correlated defaults and systemic risk are clearly priced in credit portfolio securities such as CDOs or index CDSs. In this paper we study an extensive CDX data set for evidence whether correlated defaults are also present in the underlying CDS market. We develop a cash flow based top-down...