Is Infrastructure Capital Productive? A Dynamic Heterogeneous Approach
Bank of Spain; Universidad Carlos III de Madrid
World Bank - Office of the Chief Economist; World Bank - Development Research Group (DECRG)
June 1, 2011
World Bank Policy Research Working Paper No. 5682
This paper offers an empirical evaluation of the output contribution of infrastructure. Drawing from a large data set on infrastructure stocks covering 88 countries and spanning the years 1960-2000, and using a panel time-series approach, the paper estimates a long-run aggregate production function relating GDP to human capital, physical capital, and a synthetic measure of infrastructure given by the first principal component of infrastructure endowments in transport, power, and telecommunications. Tests of the cointegration rank allowing it to vary across countries reveal a common rank with a single cointegrating vector, which is taken to represent the long-run production function. Estimation of its parameters is performed using the pooled mean group estimator, which allows for unrestricted short-run parameter heterogeneity across countries while imposing the (testable) restriction of long-run parameter homogeneity. The long-run elasticity of output with respect to the synthetic infrastructure index ranges between 0.07 and 0.10. The estimates are highly significant, both statistically and economically, and robust to alternative dynamic specifications and infrastructure measures. There is little evidence of long-run parameter heterogeneity across countries, whether heterogeneity is unconditional, or conditional on their level of development, population size, or infrastructure endowments.
Number of Pages in PDF File: 34
Keywords: Transport Economics Policy & Planning, Economic Theory & Research, Banks & Banking Reform, Public Sector Economics, Infrastructure Economics
Date posted: June 25, 2011
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