Briec, Walter; Oms, Laurence; Paget-Blanc, Eric - In: Finance Research Letters 11 (2014) 3, pp. 295-302
The shortage function has recently been introduced in portfolio selection theory for measuring efficiency. In this paper we focuss on the case of shortselling. We show that, in such a case, the shortage function can be computed in closed form. Some issues concerning duality are also analyzed. We...