Quality Change in Capital Goods and its Impact on Economic Growth

48 Pages Posted: 25 May 2006 Last revised: 1 Oct 2010

See all articles by Charles R. Hulten

Charles R. Hulten

University of Maryland - Department of Economics; National Bureau of Economic Research (NBER)

Date Written: May 1996


This paper argues that productivity puzzles like the Solow Paradox arise, in part, from the omission of an important dimension of the debate: the resource cost of achieving a given rate of technical change. A remedy is proposed in which a new parameter, defined as the cost elasticity of producing capital with respect to the rate of technical change, is introduced. This parameter is shown to be latent in the Hall-Jorgenson user-cost of capital, as well as in the Solow residual. It is also shown that an increase in the rate of embodied technical change may actually cause a decrease in the Solow residual, in the short run, if the parameter is greater than the ratio of the user cost to the corresponding asset price. Different values of the new parameter also correspond to different theories of technological innovation: the Solow-Swan and Cass-Koopmans assumption of costless technical change is consistent with a zero value of the cost elasticity parameter, while the model of endogenous growth with R&D externalities implies a larger value. Finally, the appropriate investment-good price deflator is shown to be a function of the cost-elasticity. When the parameter equals zero, no quality adjustment should be undertaken, but values greater than zero lead to a partial adjustment for quality change, and a value of one leads to a full correction.

Suggested Citation

Hulten, Charles R., Quality Change in Capital Goods and its Impact on Economic Growth (May 1996). NBER Working Paper No. w5569, Available at SSRN: https://ssrn.com/abstract=225531

Charles R. Hulten (Contact Author)

University of Maryland - Department of Economics ( email )

College Park, MD 20742
United States

National Bureau of Economic Research (NBER)

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

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