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The Generalised value at risk admissable set: constraint consistency and portfolio outcomes

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  • Bowden, Roger

Abstract

Generalised value at risk (GVaR) adds a conditional value at risk or censored mean lower bound to the standard value at risk and considers portfolio optimisation problems in the presence of both constraints. For normal distributions the censored mean is synonymous with the statistical hazard function, but this is not true for fat-tailed distributions. The latter turn out to imply much tighter bounds for the admissible portfolio set and indeed for the logistic, an upper bound for the portfolio variance that yields a simple portfolio choice rule. The choice theory in GVaR is in general not consistent with classic Von Neumann Morgenstern utility functions for money. A re-specification is suggested to make it so that gives a clearer picture of the economic role of the respective constraints. This can be used analytically to explore the choice of portfolio hedges.

Suggested Citation

  • Bowden, Roger, 2026. "The Generalised value at risk admissable set: constraint consistency and portfolio outcomes," Working Paper Series 33502, Victoria University of Wellington, School of Economics and Finance.
    • Handle: RePEc:vuw:vuwecf:33502
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    File URL: https://ir.wgtn.ac.nz/handle/123456789/33502
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