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Effects of Patent Length on R&D: A Quantitative DGE Analysis

  • Chu, Angus C.

This paper develops an R&D-growth model and calibrates the model to aggregate data of the US economy to quantify a structural relationship between patent length, R&D and consumption. Under parameter values that match the empirical flow-profit depreciation rate of patents and other key features of the US economy, extending the patent length beyond 20 years leads to a negligible increase in R&D despite equilibrium R&D underinvestment. In contrast, shortening the patent length leads to a significant reduction in R&D and consumption. Finally, this paper also analytically derives and quantifies a dynamic distortionary effect of patent length on capital investment.

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File URL: http://mpra.ub.uni-muenchen.de/16918/1/MPRA_paper_16918.pdf
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Paper provided by University Library of Munich, Germany in its series MPRA Paper with number 16918.

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Date of creation: Aug 2009
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Handle: RePEc:pra:mprapa:16918
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  1. Paul Romer, 1989. "Endogenous Technological Change," NBER Working Papers 3210, National Bureau of Economic Research, Inc.
  2. Charles I. Jones, 1999. "Growth: With or Without Scale Effects?," American Economic Review, American Economic Association, vol. 89(2), pages 139-144, May.
  3. Rachel Ngai & Roberto Samaniego, 2011. "Accounting for Research and Productivity Growth Across Industries," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 14(3), pages 475-495, July.
  4. Charles I. Jones & John C. Williams, 1998. "Measuring The Social Return To R&D," The Quarterly Journal of Economics, MIT Press, vol. 113(4), pages 1119-1135, November.
  5. Nancy T. Gallini, 2002. "The Economics of Patents: Lessons from Recent U.S. Patent Reform," Journal of Economic Perspectives, American Economic Association, vol. 16(2), pages 131-154, Spring.
  6. Diego Comin, 2004. "R&D: A Small Contribution to Productivity Growth," Journal of Economic Growth, Springer, vol. 9(4), pages 391-421, December.
  7. Jaffe Adam B. & Lerner Josh, 2006. "Innovation and Its Discontents," Capitalism and Society, De Gruyter, vol. 1(3), pages 1-36, December.
  8. Basu, Susanto & Fernald, John G, 1997. "Returns to Scale in U.S. Production: Estimates and Implications," Journal of Political Economy, University of Chicago Press, vol. 105(2), pages 249-83, April.
  9. Jones, Charles I, 1995. "R&D-Based Models of Economic Growth," Journal of Political Economy, University of Chicago Press, vol. 103(4), pages 759-84, August.
  10. Judd, Kenneth L, 1985. "On the Performance of Patents," Econometrica, Econometric Society, vol. 53(3), pages 567-85, May.
  11. Daron Acemoglu, 2007. "Introduction to Modern Economic Growth," Levine's Bibliography 122247000000001721, UCLA Department of Economics.
  12. Ted O'Donoghue & Josef Zweim¸ller, 2004. "Patents in a Model of Endogenous Growth," Journal of Economic Growth, Springer, vol. 9(1), pages 81-123, 03.
  13. Luis A. Rivera-Batiz & Paul M. Romer, 1990. "Economic Integration and Endogenous Growth," NBER Working Papers 3528, National Bureau of Economic Research, Inc.
  14. James Bessen, 2006. "The Value of U.S. Patents by Owner and Patent Characteristics," Working Papers 0603, Research on Innovation.
  15. Futagami, Koichi & Iwaisako, Tatsuro, 2007. "Dynamic analysis of patent policy in an endogenous growth model," Journal of Economic Theory, Elsevier, vol. 132(1), pages 306-334, January.
  16. Kwan, Yum K. & Lai, Edwin L. -C., 2003. "Intellectual property rights protection and endogenous economic growth," Journal of Economic Dynamics and Control, Elsevier, vol. 27(5), pages 853-873, March.
  17. Jones, Charles I, 1995. "Time Series Tests of Endogenous Growth Models," The Quarterly Journal of Economics, MIT Press, vol. 110(2), pages 495-525, May.
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