In this paper, we generalize the notion of Pareto-efficiency to make it applicable to environments with endogenous populations. Two different efficiency concepts are proposed, P-efficiency and A-efficiency. The two concepts differ in how they treat people that are not born. We show how these...

We examine the effects of changes of government provided old age pensions on fertility choices in the context of two models of fertility, the one by Barro and Becker (1989), and the one inpired by Caldwell and developed by Boldrin and Jones (2002). In the Barro and Becker model parents have...