We reexamine several bodies of data on the growth of output, labor, and capital, within the context of a model that admits the possibility of an externality to the capital input. The model is an augmented version of Paul Romer's (1987) reformulation of the Solow model. Unlike Romer, however, we...

This paper tackles two puzzles: the high empirical elasticity of aggregte output with respect to the measured capital input and the seemingly high variability of growth rates over countries in the medium run. We find that one need not invoke increasing returns or externalities to capital to...

We ask what level of migration would maximize world welfare. We find that skill-neutral policies are never optimal. An egalitarian welfare function induces a policy that entails moving mainly unskilled immigrants into the rich countries, whereas a welfare function skewed highly towards the rich...

Since the writing of David Hume, in the eighteenth century, there has been a general agreement amogst economists that an increase in the stock of money leads, initially, to an increase in economic activity. Most writer have attributed the real effects of money, in the short run, to mistaken...

Most authors have attributed the real effects of money in the short run either to mistaken expectations or to non-market clearing or both. In this paper we argue that neither of these channels is needed to explain the facts. We show that a competitive market clearing model in which money enters...