Coping with rational prodigals: A theory of social security and savings subsidies

The rational prodigality argument, which often serves to justify social security, is considered in a second-best tax framework with endogenous labour supply. Rational prodigality renders the familiar policies time-inconsistent. I analyse time-consistent policies and show that a wage tax suffices to rule out prodigality as a rational strategy. However, by using savings subsidies the solution can be improved upon. The subsidies are shown to be decreasing in income. A social security system with increasing contributions is not needed in either case.