Models of Growth and Firm Heterogeneity
综述了能解释美国企业就业规模分布呈帕累托分布且平稳的一般均衡模型，探讨新企业和在位企业创新对总增长的作用，并指出平衡增长路径依赖于进入成本的假设。
Although employment at individual firms tends to be highly nonstationary, the employment size distribution of all firms in the United States appears to be stationary. It closely resembles a Pareto distribution. There is a lot of entry and exit, mostly of small firms. This review surveys general equilibrium models that can be used to interpret these facts and explores the role of innovation by new and incumbent firms in determining aggregate growth. The existence of a balanced growth path with a stationary employment size distribution depends crucially on assumptions made about the cost of entry. Some type of labor must be an essential input in setting up new firms.