Effects of Economic Interactions on Credit Risk

Details Effects of Economic Interactions on Credit Risk Effects of Economic Interactions on Credit Risk

2005-12-16

arxiv.org/abs/physics/0512155v1

Physics

Physics and Society

24 pages, 6 figures

Scientific paper

10.1088/0305-4470/39/10/001

We study a credit risk model which captures effects of economic interactions on a firm's default probability. Economic interactions are represented as a functionally defined graph, and the existence of both cooperative, and competitive, business relations is taken into account. We provide an analytic solution of the model in a limit where the number of business relations of each company is large, but the overall fraction of the economy with which a given company interacts may be small. While the effects of economic interactions are relatively weak in typical (most probable) scenarios, they are pronounced in situations of economic stress, and thus lead to a substantial fattening of the tails of loss distributions in large loan portfolios. This manifests itself in a pronounced enhancement of the Value at Risk computed for interacting economies in comparison with their non-interacting counterparts.

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