“…It will also implement lumpsum taxation /subsidization in the third stage, once uncertainty regarding fertility has realized. 19 In the second stage, before uncertainty realizes, individuals make their choices of labour supply, of consumption and, eventually, of investment in ART, conditional on the taxation scheme. When nature realizes, in the third stage, the government implements (positive or negative) lump-sum taxes, denoted by T i,1 and T i,0 , for all i = 2, 4 who resorted to ART and had a child or not, as well as T i,1 for individuals with types i = 1, 3 with no fecundity problems, so as to redistribute resources between individuals with unequal productivity and fecundity as well as to compensate them for (ex-post) inequalities in realized fertility.…”