Capital requirements with defaultable securities
We study capital requirements for bounded financial positions defined as the minimum amount of capital to invest in a chosen eligible asset targeting a pre-specified acceptability test. We allow for general acceptance sets and general eligible assets, including defaultable bonds. Since the payoff of these assets is not necessarily bounded away from zero the resulting risk measures cannot be transformed into cash-additive risk measures by a change of numeraire. However, extending the range of eligible assets is important because, as exemplified by the recent financial crisis, assuming the existence of default-free bonds may be unrealistic. We focus on finiteness and continuity properties of these general risk measures. As an application, we discuss capital requirements based on Value-at-Risk and Tail-Value-at-Risk acceptability, the two most important acceptability criteria in practice. Finally, we prove that there is no optimal choice of the eligible asset. Our results and our examples show that a theory of capital requirements allowing for general eligible assets is richer than the standard theory of cash-additive risk measures.
|Date of creation:||Mar 2012|
|Date of revision:||Jan 2014|
|Publication status:||Published in Insurance: Mathematics and Economics, 55, 58-67 (2014)|
|Contact details of provider:|| Web page: http://arxiv.org/|
References listed on IDEAS
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- Frittelli, Marco & Rosazza Gianin, Emanuela, 2002. "Putting order in risk measures," Journal of Banking & Finance, Elsevier, vol. 26(7), pages 1473-1486, July.
- Damir Filipović, 2008.
"Optimal Numeraires For Risk Measures,"
Wiley Blackwell, vol. 18(2), pages 333-336.
- Damir Filipovic, 2007. "Optimal Numeraires for Risk Measures," Research Paper Series 187, Quantitative Finance Research Centre, University of Technology, Sydney.
- Patrick Cheridito & Tianhui Li, 2009. "Risk Measures On Orlicz Hearts," Mathematical Finance, Wiley Blackwell, vol. 19(2), pages 189-214.
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- Hans Föllmer & Alexander Schied, 2002. "Convex measures of risk and trading constraints," Finance and Stochastics, Springer, vol. 6(4), pages 429-447. Full references (including those not matched with items on IDEAS)
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