Measuring Market Power in U.S. Industry

Matthew Shapiro

No 828, Cowles Foundation Discussion Papers from Cowles Foundation for Research in Economics, Yale University

Abstract: Non-competitive conduct can be assessed by estimating the size of the markup or Lerner index achieves in a market. The markup implies a price elasticity of demand faced by the representative firm. For a given markup, non-competitive conduct that is insensitive to the value of the monopoly. To implement this measure, both the firm's and the market elasticities of demand must be estimated. Hall shows how to estimate the markup, and hence the elasticity faced by the firm, from the cyclical behavior of productivity. To estimate the market elasticity, an instrumental variables procedure exploiting a covariance restriction between productivity shocks and demand shocks is used. Results for broad sectors of private industry and for non-durable manufacturing industries display a wide range of monopoly power.

Keywords: Market power; markup; Lerner index; elasticities; monopoly power; instrumental variables (search for similar items in EconPapers)
Pages: 37 pages
Date: 1987-04
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Citations: View citations in EconPapers (27)

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