General convex order on risk aggregation

Edgars Jakobsons, Xiaoying Han and Ruodu Wang

Scandinavian Actuarial Journal, 2016, vol. 2016, issue 8, 713-740

Abstract: Using a general notion of convex order, we derive general lower bounds for risk measures of aggregated positions under dependence uncertainty, and this in arbitrary dimensions and for heterogeneous models. We also prove sharpness of the bounds obtained when each marginal distribution has a decreasing density. The main result answers a long-standing open question and yields an insight in optimal dependence structures. A numerical algorithm provides bounds for quantities of interest in risk management. Furthermore, our numerical results suggest that the bounds obtained in this paper are generally sharp for a broader class of models.

Date: 2016
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DOI: 10.1080/03461238.2015.1012223

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