A Supermartingale Relation for Multivariate Risk Measures

Zachary Feinstein and Birgit Rudloff

Papers from arXiv.org

Abstract: The equivalence between multiportfolio time consistency of a dynamic multivariate risk measure and a supermartingale property is proven. Furthermore, the dual variables under which this set-valued supermartingale is a martingale are characterized as the worst-case dual variables in the dual representation of the risk measure. Examples of multivariate risk measures satisfying the supermartingale property are given. Crucial for obtaining the results are dual representations of scalarizations of set-valued dynamic risk measures, which are of independent interest in the fast growing literature on multivariate risks.

Date: 2015-10, Revised 2018-01
New Economics Papers: this item is included in nep-rmg and nep-upt
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