This study examines a crucial assumption in much of the recent work on endogenous growth, namely, constant returns to scale in the production of human capital. A simple model is constructed to show that the returns to scale in human capital production can be inferred from the relationship...

This paper aims to contribute to the new growth theory with a model in which the engine of growth is human capital growth. Building on Romer's [1990] model, two new functions are introduced: (1) a specification for the production of new designs that assumes no externalities and no inventions...