NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Product Substitutability and Productivity Dispersion

Chad Syverson

NBER Working Paper No. 10049
Issued in October 2003
NBER Program(s):   PR

There are tremendous across-plant differences in measured productivity levels, even within narrowly defined industries. Most of the literature attempting to explain this heterogeneity has focused on technological (supply-side) factors. However, an industry's demand structure may also influence the shape of its plant-level productivity distribution. This paper explores the role of one important element of demand, product substitutability. The connection between substitutability and the productivity distribution is intuitively straightforward. When industry consumers can easily switch between suppliers, it is more difficult for relatively inefficient (high-cost) producers to profitably operate. Increases in product substitutability truncate the productivity distribution from below, implying less productivity dispersion and higher average productivity levels in high-substitutability industries. I demonstrate this mechanism in a simple industry equilibrium model, and then test it empirically using plant-level data from U.S. manufacturing industries. I find that as predicted, product substitutability measured in several ways is negatively related to within-industry productivity dispersion and positively related to industries' median productivity levels.

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Document Object Identifier (DOI): 10.3386/w10049

Published: Chad Syverson, 2004. "Product Substitutability and Productivity Dispersion," The Review of Economics and Statistics, MIT Press, vol. 86(2), pages 534-550, 08. citation courtesy of

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