Perspectives on Growth Theory
回顾了增长理论从哈罗德、多马到新古典及新增长理论的发展，指出资本收益不变假设不稳健，并认为构建真正的内生创新理论更有前景。
This essay relates recent developments in growth theory to problems and ideas that first engaged R. F. Harrod, E. Domar, and their neoclassical successors. The body of ‘new growth theory’ began by finding special ways to assume that there are constant returns to capital. It is shown that this is a very nonrobust assumption, thus not a good basis for growth theory. More promising is the attempt to create a genuinely endogenous theory of the process of innovation. This notion has always been present in the literature or just beneath the surface. Current ideas, for all their ingenuity, may be too mechanical.