This paper analyses the effects of rumours and changes in life expectancy in an economywith endogenous fertility and pay-as-you-go (PAYG) pensions. We show that the endogeneity of fertility makes society vulnerable to both pessimistic beliefs and an increasing life span. On the one hand, rumours...

This paper analyzes the technique of comparative dynamics (Judd, 1982) for the computation of the impact of perturbations on a steady state in a perfect-foresight model. The accuracy of this technique is demonstrated by numerical simulation experiments. Moreover, the technique is generalized to...