Network Effects and Infrastructure Productivity in Developing Countries
研究发展中国家基础设施投资的生产率是否存在阈值效应，发现基础设施存量低时投资生产率与其他投资无异，达到最低网络后边际生产率更高，主网络建成后则回落。
Abstract This study proposes to investigate the threshold effects in the productivity of infrastructure investment in developing countries. It concludes to their presence in the relationship between output and private and public inputs as well as network effects in the productivity of infrastructure. When the available stock of infrastructure is low, investment has the same productivity as non‐infrastructure investment. On the contrary, when a minimum network is available, the marginal productivity of infrastructure investment is greater than the productivity of other investments. Finally, when the main network is achieved, its marginal productivity becomes similar to the productivity of other investment.