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Multidimensional dynamic risk measure via conditional g-expectation

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  • Yuhong Xu

Abstract

This paper deals with multidimensional dynamic risk measures induced by conditional $g$-expectations. A notion of multidimensional $g$-expectation is proposed to provide a multidimensional version of nonlinear expectations. By a technical result on explicit expressions for the comparison theorem, uniqueness theorem and viability on a rectangle of solutions to multidimensional backward stochastic differential equations, some necessary and sufficient conditions are given for the constancy, monotonicity, positivity, homogeneity and translatability properties of multidimensional conditional $g$-expectations and multidimensional dynamic risk measures; we prove that a multidimensional dynamic $g$-risk measure is nonincreasingly convex if and only if the generator $g$ satisfies a quasi-monotone increasingly convex condition. A general dual representation is given for the multidimensional dynamic convex $g$-risk measure in which the penalty term is expressed more precisely. It is shown that model uncertainty leads to the convexity of risk measures. As to applications, we show how this multidimensional approach can be applied to measure the insolvency risk of a firm with interacted subsidiaries; optimal risk sharing for $\protect\gamma $-tolerant $g$-risk measures is investigated. Insurance $g$-risk measure and other ways to induce $g$-risk measures are also studied at the end of the paper.

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  • Yuhong Xu, 2010. "Multidimensional dynamic risk measure via conditional g-expectation," Papers 1011.3685, arXiv.org, revised Mar 2012.
    • Handle: RePEc:arx:papers:1011.3685
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    References listed on IDEAS

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    1. Nicole El Karoui & Claudia Ravanelli, 2007. "Cash Sub-additive Risk Measures and Interest Rate Ambiguity," Papers 0710.4106, arXiv.org.
    2. Jocelyne Bion-Nadal & Magali Kervarec, 2010. "Risk measuring under model uncertainty," Papers 1004.5524, arXiv.org, revised Dec 2010.
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