Hofert, Marius; McNeil, Alexander J. - In: Statistics & Probability Letters 98 (2015) C, pp. 79-88
Necessary and sufficient conditions for the subadditivity of Value-at-Risk (V aRα) for portfolios of bonds are presented under various dependence assumptions. For sufficiently large α, V aRα is subadditive. However, for any α one can construct portfolios for which V aRα is superadditive.