“…The problem (1.1) was intensively investigated in last decade (see, e.g., Dufiie and Richardson [9], Schwezer [36], [37], [38], Delbaen et al [8], Monat and Striker [28], Rheinländer and Schweizer [33], (RSch hereafter), Pham et al [31], Gourieroux et al [11] (GLP hereafter), Laurent and Pham [18]). …”