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Inventories and the Business Cycle: An Equilibrium Analysis of ( S , s ) Policies

  • Aubhik Khan
  • Julia K. Thomas

We develop an equilibrium business cycle model where nonconvex delivery costs lead firms to follow (S, s) inventory policies. Calibrated to postwar US data, the model reproduces two-thirds of the cyclical variability of inventory investment. Moreover, it delivers strongly procyclical inventory investment, greater volatility in production than sales, and a countercyclical inventory-to-sales ratio. Our model challenges several prominent claims involving inventories, including the widely held belief that they amplify aggregate fluctuations. Despite the comovement between inventory investment and final sales, GDP volatility is essentially unaltered by inventory accumulation, because procyclical inventory investment diverts resources from final production, thereby dampening fluctuations in sales. (JEL E22, E32).

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File URL: http://www.aeaweb.org/articles.php?doi=10.1257/aer.97.4.1165
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File URL: http://www.aeaweb.org/aer/data/sept07/20031097_data.zip
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Article provided by American Economic Association in its journal American Economic Review.

Volume (Year): 97 (2007)
Issue (Month): 4 (September)
Pages: 1165-1188

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Handle: RePEc:aea:aecrev:v:97:y:2007:i:4:p:1165-1188
Note: DOI: 10.1257/aer.97.4.1165
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  1. George J. Hall & John Rust, 1999. "An Empirical Model of Inventory Investment by Durable Commodity Intermediaries," Cowles Foundation Discussion Papers 1228, Cowles Foundation for Research in Economics, Yale University.
  2. Per Krusell & Anthony A. Smith & Jr., 1998. "Income and Wealth Heterogeneity in the Macroeconomy," Journal of Political Economy, University of Chicago Press, vol. 106(5), pages 867-896, October.
  3. Fisher, J.D.M. & Hornstein, A., 1995. "(S,s)Inventory Policies in General Equilibrium," UWO Department of Economics Working Papers 9514, University of Western Ontario, Department of Economics.
  4. Ricardo J. Caballero & Eduardo M.R.A. Engel, 1991. "Dynamic (S,s) Economies," NBER Working Papers 3734, National Bureau of Economic Research, Inc.
  5. Gary Hansen, 2010. "Indivisible Labor and the Business Cycle," Levine's Working Paper Archive 233, David K. Levine.
  6. Brad R. Humphreys & Louis J. Maccini & Scott Schuh, 1997. "Input and output inventories," Working Papers 97-7, Federal Reserve Bank of Boston.
  7. Kydland, Finn E & Prescott, Edward C, 1982. "Time to Build and Aggregate Fluctuations," Econometrica, Econometric Society, vol. 50(6), pages 1345-70, November.
  8. Valerie A. Ramey & Daniel J. Vine, 2005. "Tracking the source of the decline in GDP volatility: an analysis of the automobile industry," Finance and Economics Discussion Series 2005-14, Board of Governors of the Federal Reserve System (U.S.).
  9. Mark Bils & James A. Kahn, 1999. "What inventory behavior tells us about business cycles," Staff Reports 92, Federal Reserve Bank of New York.
  10. Aubhik Khan & Julia K. Thomas, 2002. "Nonconvex factor adjustments in equilibrium business cycle models: Do nonlinearities matter?," Staff Report 306, Federal Reserve Bank of Minneapolis.
  11. Alan S. Blinder, 1981. "Retail Inventory Behavior and Business Fluctuations," Brookings Papers on Economic Activity, Economic Studies Program, The Brookings Institution, vol. 12(2), pages 443-520.
  12. Daniele Coen-Pirani, 2003. "Microeconomic Inventory Behavior and Aggregate Inventory Dynamics," GSIA Working Papers 2003-E28, Carnegie Mellon University, Tepper School of Business.
  13. Eric J. Bartelsman & Wayne Gray, 1996. "The NBER Manufacturing Productivity Database," NBER Technical Working Papers 0205, National Bureau of Economic Research, Inc.
  14. James H. Stock & Mark W. Watson, 2003. "Has the business cycle changed?," Proceedings - Economic Policy Symposium - Jackson Hole, Federal Reserve Bank of Kansas City, pages 9-56.
  15. Rogerson, Richard, 1988. "Indivisible labor, lotteries and equilibrium," Journal of Monetary Economics, Elsevier, vol. 21(1), pages 3-16, January.
  16. Robert G. King & Sergio T. Rebelo, 2000. "Resuscitating Real Business Cycles," NBER Working Papers 7534, National Bureau of Economic Research, Inc.
  17. Prescott, Edward C., 1986. "Theory ahead of business-cycle measurement," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 25(1), pages 11-44, January.
  18. Terry J. Fitzgerald, 1997. "Inventories and the business cycle: an overview," Economic Review, Federal Reserve Bank of Cleveland, issue Q III, pages 11-22.
  19. Martin S. Eichenbaum, 1988. "Some Empirical Evidence on the Production Level and Production Cost Smoothing Models of Inventory Investment," NBER Working Papers 2523, National Bureau of Economic Research, Inc.
  20. Krusell, Per & Smith, Anthony A., 1997. "Income And Wealth Heterogeneity, Portfolio Choice, And Equilibrium Asset Returns," Macroeconomic Dynamics, Cambridge University Press, vol. 1(02), pages 387-422, June.
  21. Andreas Hornstein, 1998. "Inventory investment and the business cycle," Economic Quarterly, Federal Reserve Bank of Richmond, issue Spr, pages 49-71.
  22. Jonathan McCarthy & Egon Zakrajsek, 2000. "Microeconomic inventory adjustment: evidence from U.S. firm-level data," Staff Reports 101, Federal Reserve Bank of New York.
  23. Valerie A. Ramey & Kenneth D. West, 1997. "Inventories," NBER Working Papers 6315, National Bureau of Economic Research, Inc.
    • Ramey, Valerie A. & West, Kenneth D., 1999. "Inventories," Handbook of Macroeconomics, in: J. B. Taylor & M. Woodford (ed.), Handbook of Macroeconomics, edition 1, volume 1, chapter 13, pages 863-923 Elsevier.
  24. Ricardo J. Caballero & Eduardo M.R.A. Engel, 1996. "Explaining Investment Dynamics in U.S. Manufacturing: A Generalized (S,s) Approach," Documentos de Trabajo 12, Centro de Economía Aplicada, Universidad de Chile.
  25. Ramey, Valerie A, 1989. "Inventories as Factors of Production and Economic Fluctuations," American Economic Review, American Economic Association, vol. 79(3), pages 338-54, June.
  26. Christiano, Lawrence J., 1988. "Why does inventory investment fluctuate so much?," Journal of Monetary Economics, Elsevier, vol. 21(2-3), pages 247-280.
  27. Ramey, Valerie A, 1991. "Nonconvex Costs and the Behavior of Inventories," Journal of Political Economy, University of Chicago Press, vol. 99(2), pages 306-34, April.
  28. repec:cup:macdyn:v:1:y:1997:i:2:p:387-422 is not listed on IDEAS
  29. Caplin, Andrew S, 1985. "The Variability of Aggregate Demand with (S, s) Inventory Policies," Econometrica, Econometric Society, vol. 53(6), pages 1395-1409, November.
  30. Patricia C. Mosser, 1991. "Trade Inventories and (S,s)," The Quarterly Journal of Economics, Oxford University Press, vol. 106(4), pages 1267-1286.
  31. Kahn, James A, 1987. "Inventories and the Volatility of Production," American Economic Review, American Economic Association, vol. 77(4), pages 667-79, September.
  32. Alan S. Blinder & Louis J. Maccini, 1991. "Taking Stock: A Critical Assessment of Recent Research on Inventories," Journal of Economic Perspectives, American Economic Association, vol. 5(1), pages 73-96, Winter.
  33. Scott Schuh, 1996. "Evidence on the link between firm-level and aggregate inventory behavior," Finance and Economics Discussion Series 96-46, Board of Governors of the Federal Reserve System (U.S.).
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