This paper develops an endogenous directed technical change model that is consistent with the data on the distribution of firms and production across high- and low-tech sectors, and its relationship to economic growth, in a number of developed countries. We argue that scale effects at the...

This paper studies the firm size distribution arising from an endogenous growth model of quality ladders with expanding variety. The probability distribution function of a given cohort of firms is a Poisson distribution that converges asymptotically to a normal of log size. However, due to firm...

We revisit the issue of self-fulfilling "waves of enthusiasm" as stationary rational expectations equilibria in tournament models of horizontal and vertical R&D. By considering a lab-equipment specification, the model predicts a positive effect of animal spirits on the balanced-growth-path (BGP)...

This paper analyzes the mechanisms, other than market size, through which international trade of intermediate goods incorporating state-of-the-art technological knowledge affects accumulation of human capital and wage inequality in the North and South. Under North-South technological diffusion,...

This paper studies the effects of the diffusion of a General Purpose Technology (GPT), that spreads first within the developed country of its origin (North), and then to a developing country (South). We use a general equilibrium model of growth, where each final good is produced by one of two...

In this model of North and South economies, growth is driven by Schumpeterian R&D and by accumulation of two types of human capital, versatile and specialized. The former is school intensive while the latter is on-the-job-training intensive. Growth is endogenous and independent of scale effects....