Estimating expected credit losses on banks' portfolios has long been difficult. The issue has become of increasing interest to academics and regulators, as the FASB and IASB consider new regulations for impairment of loans. This study develops a measure of the one-year-ahead expected rate of...

We study the implications of the value at risk concept for the bank's optimum amount of equity capital under credit risk. The market value of loans is risky and lognormally distributed. We show that the required equity capital depends upon managerial and market factors. Furthermore, the bank's...

Credit risk has many facets - such as spread risk, default (jump) risk, migrational risk and correlation risk - that are modeled separately under the current Basel framework. We propose a risk metric called credit Bubble VaR (Cr. buVaR) that combines these risks under a common historical...

With the Great Recession and the regulatory reform that followed, the search for reliable means to capture systemic risk and to detect macrofinancial problems has become a central concern. In the United States, this concern has been institutionalized through the Financial Stability Oversight...

Choosing a proper external risk measure is of great regulatory importance, as exemplified in the Basel II and Basel III Accord which use Value-at-Risk (VaR) with scenario analysis as the risk measures for setting capital requirements. We argue a good external risk measure should be robust with...

Revised standards for capital requirements for market risks in a bank's trading book have been issued as a result of the Fundamental Review of the Trading Book. Under the new standards, default risk needs to be measured and capitalized through a dedicated Default Risk Charge (DRC). While...

This paper presents a modelling framework for the Incremental Risk Charge (IRC) and Comprehensive Risk Measure (CRM) as the new capital requirements for market risks in a bank’s trading book ("Basel 2.5"). Both are Value-at-Risk-type measures projecting losses over a one-year capital horizon...

The purpose of this paper is to dispel some common misunderstandings about capital adequacy rules based on Expected Shortfall. We establish that, from a theoretical perspective, Expected Shortfall based regulation can provide a misleading assessment of tail behaviour, does not necessarily...