The Effects of Public Infrastructure and R & D Capital on the Cost Structure and Performance of U.S. Manufacturing Industries

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Abstract
In this paper we examine the effects of publicly financed infrastructure and R & D capitals on the cost structure and productivity performance of twelve two-digit U.S. manufacturing industries. The results suggest that there are significant productive effects from these two types of capital. Their effects on the cost structure vary across industries. Not only is the cost function shifted downward in each industry, generating productivity inducement, but the factor demand in each industry is also affected by the two types of public capital suggesting bias effects. We also calculate the marginal benefits of the two types of public capital services in each industry and estimate the "social" rates of return to these capitals for the industries in our sample.

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