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IT and Beyond: The Contribution of Heterogenous Capital to Productivity

December 2004

Written by: Daniel Wilson

Working Paper Number:

CES-04-20

Abstract

This paper explores the relationship between capital composition and productivity using a unique and remarkably detailed data set on firm-level, asset-specific investment in the U.S. Using cross-sectional and longitudinal regressions, I find that among all types of capital, only computers, communications equipment, software, and office building are associated (positively) with current and subsequent years' multifactor productivity. The link between offices and productivity, however, is shown to be due to the correlation between the use of offices and organizational capital. In contrast, the link between ICT equipment and productivity is robust to a number of controls and appears to be part causal effect and part reflection of the correlation between ICT and firm fixed (or slow-moving) effects. The implied marginal products by capital type are derived and compared to official data on rental prices; substantial differences exist for a number of key capital types. Lastly, I provide evidence of complementaries and substitutabilities among capital types ' a rejection of the common assumption of perfect substitutability ' and between particular capital types and labor.

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investment, econometric, macroeconomic, earnings, recession, expenditure, depreciation, capital, capital productivity, investment productivity, economically, econometrician, rent

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:
Bureau of Labor Statistics, National Science Foundation, Center for Economic Studies, Ordinary Least Squares, Total Factor Productivity, Cobb-Douglas, Bureau of Economic Analysis, National Income and Product Accounts, Federal Reserve Bank, Fabricated Metal Products, Federal Reserve System, NBER Summer Institute, Generalized Method of Moments, Information and Communication Technology Survey, UC Berkeley

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