*I am thankful to James Tybout, Mark Roberts and Margaret Slade for useful comments and to the Brazilian agencies (CAPES and FUNCAP) for financial support.
ESTIMATING MARK-UPS FROM PLANT-LEVEL DATA*
Article first published online: 19 MAY 2009
© 2009 The Authors. Journal compilation © 2009 Blackwell Publishing Ltd. and the Editorial Board of The Journal of Industrial Economics
The Journal of Industrial Economics
Volume 57, Issue 2, pages 353–363, June 2009
How to Cite
DeSOUZA, S. A. (2009), ESTIMATING MARK-UPS FROM PLANT-LEVEL DATA. The Journal of Industrial Economics, 57: 353–363. doi: 10.1111/j.1467-6451.2009.00378.x
- Issue published online: 19 MAY 2009
- Article first published online: 19 MAY 2009
Typical plant-level data sets do not report quantities. This paper shows that estimating mark-ups (price-cost ratio) in product-differentiated industries using deflated sales to proxy quantity is not appropriate due to unobserved price heterogeneity. This paper presents an econometric model for estimating mark-ups that controls for unobserved prices. The model shows that ignoring price heterogeneity results in mark-up estimates that converge to one, whatever the value of the true price-cost ratio. Estimates obtained using real data are consistent with this result, as they reveal that ignoring price heterogeneity leads to spurious evidence of firms with little or no market power.