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Estimating Production Functions Using Inputs to Control for Unobservables

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James Levinsohn
Amil Petrin

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Abstract

We introduce a new method for conditioning out serially correlated unobserved shocks to the production technology by building ideas first developed in Olley and Pakes (1996). Olley and Pakes show how to use investment to control for correlation between input levels and the unobserved firm-specific productivity process. We prove that like investment, intermediate inputs (those inputs which are typically subtracted out in a value-added production function) can also solve this simultaneity problem. We highlight three potential advantages to using an intermediate inputs approach relative to investment. Our results indicate that these advantages are empirically important.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 7819.

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Date of creation: Aug 2000
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Handle: RePEc:nbr:nberwo:7819

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This page was last updated on 2010-2-6.

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