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IFS Working Papers
February 2005 W05/04
Article
Adjustment costs and the identification of Cobb Douglas production functions
Type: IFS Working Papers
Authors: Steve Bond and Måns Söderbom
ISSN: 1742-0415
Volume, issue, pages: 30 pp.
JEL classification: D20, D24, C23
Keywords: Production functions, adjustment costs, identification

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Cobb Douglas production function parameters are not identified from cross-section variation when inputs are perfectly flexible and chosen optimally, and input prices are common to all firms. We consider the role of adjustment costs for inputs in identifying these parameters in this context. The presence of adjustment costs for all inputs allows production function parameters to be identified, even in the absence of variation in input prices. This source of identification appears to be quite fragile when adjustment costs are deterministic, but more useful in the case of stochastic adjustment costs. We illustrate these issues using simulated production data.

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