[eng] Notes on capital labor substitution. . At an empirical level we provide evidence of the large substitution of capital for labor which took place in France during the last 25 years and we analyze the resulting evolutions of factor productivities. At a theoretical level we use a simple model...

[fre] Hystérésis et piège du sous-développement dans un modèle de croissance endogène. . Nous reprenons le modèle canonique de Romer [1986] pour en préciser les propriétés d'hystérésis. Nous montrons ensuite comment l'introduction d'un effet de seuil dans ce modèle implique la...

[eng] Saving, investment and mcwey in an intertemporal setting . Antoine D'autume, Philippe Michel. Following recent work of O. J. Blanchard and J. Sachs, we analyze perfect foresight equilibria in a model where both a producer and a consumer solve an intertemporal optimization problem. We show...

This paper studies the undiscounted utilitarian optimal paths of the canonical Dasgupta--Heal--Solow model when the stock of natural capital is a direct argument of well-being, besides consumption. We use a Keynes--Ramsey rule which yields a generalization of Hartwick's rule. We characterize...

This paper studies the undiscounted utilitarian optimal paths of the canonical Dasgupta-Heal-Solow model when the stock of natural capital is a direct argument of well-being, besides consumption. We use a Keynes-Ramsey rule wich yields a generalization of Hartwick's rule : if society has a zero...

Following Stollery [1998], we extend the Solow, Dasgupta-Heal model to analyze the effects of global warning. The rise of temperature is caused by the use of fossil resources so that the temperature level can be linked to the remaining stock of these resources. The rise of temperature affects...

In this paper, the two-period OLG model has been modified to distinguish the effects of individual ageing from changes in the birth rate. Optimal pension and retirement age policies have been characterized in a dynamic framework. We have considered a mixed pension scheme that is fully funded,...