“…The optimal benefit level has no particular time dimension within the first issue whereas the preliminary step in the optimal time sequence of benefits, that is the government's commitment to a stated level of discounted expected utility for the worker at time zero 19 , is simply a given, which acts as a constraint in the analytical constructions 17 Within different approaches many works have been developed on these issues. Let me mention the recent analyses in Dolls, Fuest, Neumann, andPeichl (2018), Fischer (2017), O'Leary, Barnow, and Lenaerts (2020). Clearly, these issues raise a large set of questions.…”