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Risks 2018, 6(3), 72;

Extreme Portfolio Loss Correlations in Credit Risk

Fakultät für Physik, Universität Duisburg-Essen, Lotharstraße 1, 47048 Duisburg, Germany
Author to whom correspondence should be addressed.
Received: 17 May 2018 / Revised: 22 June 2018 / Accepted: 10 July 2018 / Published: 17 July 2018
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The stability of the financial system is associated with systemic risk factors such as the concurrent default of numerous small obligors. Hence, it is of utmost importance to study the mutual dependence of losses for different creditors in the case of large, overlapping credit portfolios. We analytically calculate the multivariate joint loss distribution of several credit portfolios on a non-stationary market. To take fluctuating asset correlations into account, we use an random matrix approach which preserves, as a much appreciated side effect, analytical tractability and drastically reduces the number of parameters. We show that, for two disjoint credit portfolios, diversification does not work in a correlated market. Additionally, we find large concurrent portfolio losses to be rather likely. We show that significant correlations of the losses emerge not only for large portfolios with thousands of credit contracts, but also for small portfolios consisting of a few credit contracts only. Furthermore, we include subordination levels, which were established in collateralized debt obligations to protect the more senior tranches from high losses. We analytically corroborate the observation that an extreme loss of the subordinated creditor is likely to also yield a large loss of the senior creditor. View Full-Text
Keywords: portfolio credit risk; systemic risk; diversification; portfolio loss correlation; collateralized debt obligations; non-stationarity portfolio credit risk; systemic risk; diversification; portfolio loss correlation; collateralized debt obligations; non-stationarity

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Mühlbacher, A.; Guhr, T. Extreme Portfolio Loss Correlations in Credit Risk. Risks 2018, 6, 72.

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