A Random Matrix Approach to Credit Risk

Details A Random Matrix Approach to Credit Risk A Random Matrix Approach to Credit Risk

2011-02-18

arxiv.org/abs/1102.3900v7

Economy

Quantitative Finance

Risk Management

Fully revised version; 15 pages, 8 figures

Scientific paper

We estimate generic statistical properties of a structural credit risk model by considering an ensemble of correlation matrices. This ensemble is set up by Random Matrix Theory. We demonstrate analytically that the presence of correlations severely limits the effect of diversification in a credit portfolio if the correlations are not identically zero. The existence of correlations alters the tails of the loss distribution considerably, even if their average is zero. Under the assumption of randomly fluctuating correlations, a lower bound for the estimation of the loss distribution is provided.

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