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Why Plant-Level Productivity Studies are Often Misleading, and an Alternative Approach to Interference

  • Haijime Katayama
  • Shihua Lu
  • James Tybout

Applied economists often wish to measure the effects of managerial decisions or policy changes on plant-level productivity patterns. But plant-level data on physical quantities of output, capital, and intermediate inputs are usually unavailable. Therefore, when constructing productivity measures, most analysts proxy these variables with real sales revenues, depreciated capital spending, and real input expenditures. The first part of this paper argues that the resultant productivity indices have little to do with technical efficiency, product quality, or contributions to social welfare. Nonetheless, they are likely to be correlated with policy shocks and managerial decisions in misleading ways. The second part of the paper develops an alternative approach to inference. Using Steven Berry's (1994, RAND Journal) representation of equilibrium in a differentiated product market, we show how to impute each plant's unobserved marginal costs and product quality from its observed revenues and costs, and how to use this mapping to calculate plant-specific welfare-based performance measures. (Bayesian estimation techniques are required because the vector of unknown parameters is under-identified.) The final part of the paper demonstrates our methodology using panel data on Colombian pulp and paper plants.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 9617.

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Date of creation: Apr 2003
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Handle: RePEc:nbr:nberwo:9617
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  11. Kraay, Aart & Soloaga, Isidro & Tybout, James, 2002. "Product quality, productive efficiency, and international technology diffusion : evidence from plant-level panel data," Policy Research Working Paper Series 2759, The World Bank.
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  16. Caplin, Andrew & Nalebuff, Barry, 1991. "Aggregation and Imperfect Competition: On the Existence of Equilibrium," Econometrica, Econometric Society, vol. 59(1), pages 25-59, January.
  17. Steven T. Berry, 1994. "Estimating Discrete-Choice Models of Product Differentiation," RAND Journal of Economics, The RAND Corporation, vol. 25(2), pages 242-262, Summer.
  18. Blomstrom, Magnus & Kokko, Ari, 1997. "How foreign investment affects host countries," Policy Research Working Paper Series 1745, The World Bank.
  19. Aitken, Brian & Harrison, Ann & DEC, 1994. "Do domestic firms benefit from foreign direct investment? Evidence from panel data," Policy Research Working Paper Series 1248, The World Bank.
  20. Tybout, James R. & Westbrook, M. Daniel, 1995. "Trade liberalization and the dimensions of efficiency change in Mexican manufacturing industries," Journal of International Economics, Elsevier, vol. 39(1-2), pages 53-78, August.
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  22. Henderson, J. Vernon, 2003. "Marshall's scale economies," Journal of Urban Economics, Elsevier, vol. 53(1), pages 1-28, January.
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