If environmental quality positively affects the productivity of labor in R&D and pollution is caused by the use of a non-renewable resource, it is socially optimal to postpone extraction and to intertemporally adjust R&D effort.

We advance an original assumption whereby a good state of the environment positively affects labor productivity in R&D such that deteriorating environmental quality negatively impacts R&D. We study the implications of this assumption for the optimal solution in an R&D-based model of growth,...

We argue that education exerts positive external effects on health, beyond the standard internal effects documented in the literature. We put forward a model that clarifies the links between education and longevity in the presence of such an externality. We then implement an innovative approach...

The effective labor possibility frontier (ELPF) is defined as the set of statically efficient allocations of labor imputs in the competing tasks of production and R&D. It summaries the labor scarcity constraint. We show that the dynamically efficient paths of R&D, resource extraction and...

Environmental policy affects the distribution of market shares if intermediate goods are differentiated in their pollution intensity. When innovations are environment-friendly, a tax on emissions skews demand towards new goods which are the most productive. In this case, the tax has to increase...

We show that the social desirability of a resource substitute systematically depends on the pattern of resources—either renewable (RR) or non-renewable (NRR)—involved in the resource substitute development program. Developing a RR in an NRR-based economy is particularly rewarding...

Economists generally hold that environmental regulations impose constraints on the production possibilities set and are therefore potentially harmful to economic growth. In recent years, however, it has been recognized that environmental regulation can enhance the prospects for growth if...

On modifie le modèle leader-imitateur de Barro et Sala-i-Martin [1997] en supposant qu?au fur et à mesure que le retard technologique s?accroît, la productivité de la R&D (i) d?abord augmente puis diminue dans la région en retard, et (ii) elle diminue dans la région leader pour des retards...