Bounds for Functions of Dependent Risks

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Bounds for Functions of Dependent Risks

by Paul Embrechts of ETH Zurich, and
Giovanni Puccetti of the University of Firenze

September 2005

Abstract: The problem of finding the best-possible lower bound on the distribution of a non-decreasing function of n dependent risks is solved when n = 2 and a lower bound on the copula of the portfolio is provided. The problem gets much more complicated in arbitrary dimensions. When no information on the structure of dependence of the random vector is available, we provide a bound on the distribution function of the sum of risks, which we prove to be better than the one generally used in the literature.

JEL Classification: G10.

AMS Classification: 60E15, 60E05.

Keywords: copulas, dependent risks, dependency bounds, Fréchet bounds.

Published in: Finance and Stochastics, Vol. 10, No. 3, (September 2006), pp. 341-352.

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