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| Effects of Economic Interactions on Credit Risk by Jonathan P.L. Hatchett of RIKEN BSI, Japan, and March 2006 Abstract: 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. PACS: 02.50.-r, 05.40.-a, 89.65.Gh, 89.75.Da. Published in: Journal of Physics A: Mathematical and General, Vol. 39, No. 10, (March 2006), pp. 2231–2251. Books Referenced in this Paper: (what is this?)
Download paper (401K PDF) 21 pages Related reading: A Simple Model of Credit Contagion
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