# 15-024/IV/DSF86 (2015-02-12)

Ka Chun Cheung, The University of Hong Kong, Hong Kong, PR of China; Michel Denuit, Université Catholique de Louvain, Belgium; Jan Dhaene, Katholieke Universiteit Leuven, Belgium, University of the Free State, Bloemfontein, South Africa
Mutual exclusivity, stop-loss transform, tail convex order, risk measures
JEL codes:
G19, C63

In this paper, we extend the concept of mutual exclusivity proposed by Dhaene and Denuit (1999) to its tail counterpart and baptise this new dependency structure as tail mutual exclusivity. Probability levels are first specified for each component of the random vector.
Under this dependency structure, at most one exceedance over the corresponding VaRs is possible, the other components being zero in such a case. No condition is imposed when all components stay below the VaRs. Several properties of this new negative dependence concept are derived. We show that this dependence structure gives rise to the smallest value of Tail-VaR of a sum of risks within a given Fr├ęchet space, provided that the probability
level of the Tail-VaR is close enough to one.