Aggregating Credit and Market Risk: The Impact of Model Specification

Arbeitspapier

We investigate the effect of model specification on the aggregation of (correlated) market and credit risk. We focus on the functional form linking systematic credit risk drivers to default probabilities. Examples include the normal based probit link function for typical structural models, or the exponential (Poisson) link function for typical reduced form models. We first show analytically how model specification impacts 'diversification benefits' for aggregated market and credit risk. The specification effect can lead to Value-at-Risk (VaR) reductions in the range of 3 percent to 47 percent, particularly at high confidence level VaRs. We also illustrate the effects using a fully calibrated empirical model for US data. The empirical effects corroborate our analytic results.

Object Details

• Language: Englisch

References and Relationships

• Bibliographic citation: Series: Tinbergen Institute Discussion Paper ; No. 12-057/2/DSF36

Classification and Topics

• Classification: Wirtschaft ; Financing Policy; Financial Risk and Risk Management; Capital and Ownership Structure; Value of Firms; Goodwill ; Banks; Depository Institutions; Micro Finance Institutions; Mortgages ; Financial Econometrics
• Subject: risk aggregation ; credit risk ; market risk ; link function ; diversification ; reduced form models ; structural models

Contributors, Places and Time

• Event: Geistige Schöpfung
• (who): Lucas, Andre ; Verhoef, Bastiaan
• Event: Veröffentlichung
• (who): Tinbergen Institute
• (where): Amsterdam and Rotterdam
• (when): 2012

Further information

• Handle: http://hdl.handle.net/10419/87363
• Last update: 10.03.2025, 11:43 AM CET