This paper first provides a simple but very general framework for credit portfolio modellingwhich is based on the distinction between systematic and unsystematic risk. Unsystematicor borrower-specific risk vanishes through diversification in a very large, infinitelyfine-grained portfolio. The...

The relationship between decision-making and risk carries significant implications, particularly within the context of financial institutions. Understanding the causal connection between these two factors is essential, especially when considering the broader implications of social...

The granularity adjustment technique is embedded into a general multi-factor model. ... In this paper, a counter-example with negative value of the granularity adjustment is given for the well-known Vasicek (2002) model.

In attempting to promote bank stability, the Basel Committee on Banking Supervision (2006) provides a framework that seeks to control the amount of tail risk that large banks take in their trading books. However, banks around the world suffered sizeable trading losses during the recent crisis....

Policy makers have developed different forms of policy intervention for stopping, or preventing runs on financial firms. This paper provides a general framework to characterize the types of policy intervention that indeed lower the run-propensity of investors versus those that cause adverse...

We study the impact of disclosure about bank fundamentals on depositors' behavior in the presence (and absence) of economic linkages between financial institutions. Using a controlled laboratory environment, we identify under which conditions disclosure is conducive to bank stability. We find...

Policy makers have developed different forms of policy intervention for stopping, or preventing runs on financial firms. This paper provides a general framework to characterize the types of policy intervention that indeed lower the run-propensity of investors versus those that cause adverse...

This paper analyses the risk and return of loans portfolios in a joint setting. I develop a model to obtain the distribution of loans returns. I use this model to describe the investment opportunity set of lenders using mean-variance analysis with a Value at Risk constraint. I also obtain closed...

This paper discusses different aspects of the notion of systemic risk. It contains a selective survey of the research on related topics, a review of some case studies of financial crises and failures, and a discussion pointing toward the importance of moral hazard as a key element of systemic...