A Dynamic Model of Investment and Endogenous Growth
提出一个“边看边学”模型，揭示生产率增长与投资率之间的非线性关系，导致多重稳态增长率，并产生增长与周期并存的动态结构。
Models of endogenous growth assume that private investment in either physical or human capital yields positive externalities to production possibilities as a whole. But what is the structure of such externalities? We present a model of 'learning by watching'which implies a nonlinear relationship between productivity growth and the investment rate. This results in multiple steady-state growth rates in a deterministic setting, and in a rich dynamic structure that generates both growth and cycles in a stochastic model (calibrated by reference to observable shocks to tax rates in the United Kingdom). Economies with identical structures can experience very different growth rates for long periods. The model exhibits path-dependence and history matters. Copyright 1993 by The editors of the Scandinavian Journal of Economics.