Quality Ladders, Competition and Endogenous Growth
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- Michele Boldrin & David K Levine, 2010. "Quality Ladders, Competition and Endogenous Growth," Levine's Working Paper Archive 661465000000000028, David K. Levine.
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- Serguey Braguinsky & Salavat Gabdrakhmanov & Atsushi Ohyama, 2007. "A Theory of Competitive Industry Dynamics With Innovation and Imitation," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 10(4), pages 729-760, October.
- Aghion, Philippe & Howitt, Peter, 1992.
"A Model of Growth through Creative Destruction,"
Econometrica, Econometric Society, vol. 60(2), pages 323-351, March.
- Aghion, P. & Howitt, P., 1989. "A Model Of Growth Through Creative Destruction," University of Western Ontario, Departmental Research Report Series 8904, University of Western Ontario, Department of Economics.
- Aghion, Philippe & Howitt, Peter, 1992. "A Model of Growth Through Creative Destruction," Scholarly Articles 12490578, Harvard University Department of Economics.
- Aghion, P. & Howitt, P., 1990. "A Model Of Growth Through Creative Destruction," DELTA Working Papers 90-12, DELTA (Ecole normale supérieure).
- Philippe Aghion & Peter Howitt, 1990. "A Model of Growth Through Creative Destruction," NBER Working Papers 3223, National Bureau of Economic Research, Inc.
- Aghion, P. & Howitt, P., 1989. "A Model Of Growth Through Creative Destruction," Working papers 527, Massachusetts Institute of Technology (MIT), Department of Economics.
- Boldrin, Michele & Levine, David K., 2008.
"Perfectly competitive innovation,"
Journal of Monetary Economics, Elsevier, vol. 55(3), pages 435-453, April.
- Michele Boldrin & David K Levine, 2000. "Perfectly Competitive Innovation," Levine's Working Paper Archive 1996, David K. Levine.
- Boldrin, Michele & Levine, David K., 2002. "Perfectly Competitive Innovation," CEPR Discussion Papers 3274, C.E.P.R. Discussion Papers.
- Michele Boldrin & David K. Levine, 2002. "Perfectly competitive innovation," Staff Report 303, Federal Reserve Bank of Minneapolis.
- Michele Boldrin & David K Levine, 2002. "Perfectly Competitive Innovation," Levine's Working Paper Archive 625018000000000192, David K. Levine.
- Michele Boldrin & David K Levine, 2006. "Perfectly Competitive Innovation," Levine's Working Paper Archive 618897000000000954, David K. Levine.
- McGrattan, Ellen R. & Prescott, Edward C., 2009.
"Openness, technology capital, and development,"
Journal of Economic Theory, Elsevier, vol. 144(6), pages 2454-2476, November.
- Ellen R. McGrattan & Edward C. Prescott, 2007. "Openness, technology capital, and development," Working Papers 651, Federal Reserve Bank of Minneapolis.
- Edward Prescott & Ellen McGrattan, 2008. "Openness, Technology Capital, and Development," 2008 Meeting Papers 111, Society for Economic Dynamics.
- Ellen R. McGrattan & Edward C. Prescott, 2008. "Openness, technology capital, and development," Staff Report 396, Federal Reserve Bank of Minneapolis.
- Ellen McGrattan & Edward C. Prescott, 2007. "Openness, Technology Capital, and Development," NBER Working Papers 13515, National Bureau of Economic Research, Inc.
- Gene M. Grossman & Elhanan Helpman, 1991.
"Quality Ladders in the Theory of Growth,"
The Review of Economic Studies, Review of Economic Studies Ltd, vol. 58(1), pages 43-61.
- Grossman, G.M. & Helpman, E., 1989. "Quality Ledders In The Theory Of Growth," Papers 148, Princeton, Woodrow Wilson School - Public and International Affairs.
- Gene M. Grossman & Elhanan Helpman, 1989. "Quality Ladders in the Theory of Growth," NBER Working Papers 3099, National Bureau of Economic Research, Inc.
- Boldrin,Michele & Levine,David K., 2010.
"Against Intellectual Monopoly,"
Cambridge Books,
Cambridge University Press, number 9780521127264.
- Boldrin,Michele & Levine,David K., 2008. "Against Intellectual Monopoly," Cambridge Books, Cambridge University Press, number 9780521879286, January.
- Michele Boldrin & David K Levine, 2008. "Against Intellectual Monopoly," Levine's Bibliography 122247000000002371, UCLA Department of Economics.
- Jovanovic, Boyan & MacDonald, Glenn M, 1994.
"Competitive Diffusion,"
Journal of Political Economy, University of Chicago Press, vol. 102(1), pages 24-52, February.
- Jovanovic, B. & Macdonald, G.M., 1988. "Competitive Diffusion," RCER Working Papers 160, University of Rochester - Center for Economic Research (RCER).
- Jovanovic, B. & MacDonald, G.M., 1991. "Competitive Diffusion," Papers 92-08, Rochester, Business - Financial Research and Policy Studies.
- Macdonald, G.M., 1988. "Competitive Diffusion," University of Chicago - Economics Research Center 88-10, Chicago - Economics Research Center.
- Jovanovic, Boyan & MacDonald, Glenn M., 1988. "Competitive Diffusion," Working Papers 88-29, C.V. Starr Center for Applied Economics, New York University.
- Boyan Jovanovic & Glenn MacDonald, 1993. "Competitive Diffusion," NBER Working Papers 4463, National Bureau of Economic Research, Inc.
- Boldrin, Michele & Levine, David K., 2002.
"Factor Saving Innovation,"
Journal of Economic Theory, Elsevier, vol. 105(1), pages 18-41, July.
- Michele Boldrin & David K Levine, 2001. "Factor Saving Innovation," Levine's Working Paper Archive 625018000000000088, David K. Levine.
- Michele Boldrin & David K. Levine, 2002. "Factor saving innovation," Staff Report 301, Federal Reserve Bank of Minneapolis.
- Boldrin, Michele & Levine, David K., 2002. "Factor Saving Innovation," CEPR Discussion Papers 3262, C.E.P.R. Discussion Papers.
- Boldrin, Michele & Levine, David K., 2004.
"Rent-seeking and innovation,"
Journal of Monetary Economics, Elsevier, vol. 51(1), pages 127-160, January.
- Michele Boldrin, 2003. "Rent Seeking and Innovation," Theory workshop papers 658612000000000063, UCLA Department of Economics.
- Michele Boldrin & David K Levine, 2003. "Rent Seeking and Innovation," Levine's Working Paper Archive 618897000000000465, David K. Levine.
- Michele Boldrin & David K. Levine, 2004. "Rent-seeking and innovation," Staff Report 347, Federal Reserve Bank of Minneapolis.
- Makowski, Louis & Ostroy, Joseph M, 1995.
"Appropriation and Efficiency: A Revision of the First Theorem of Welfare Economics,"
American Economic Review, American Economic Association, vol. 85(4), pages 808-827, September.
- Lewis Makowski & Joseph Ostroy, 2010. "Appropriation and Efficiency: A Revision of the First Theorem of Welfare Economics," Levine's Working Paper Archive 1386, David K. Levine.
- Klevorick, Alvin K. & Levin, Richard C. & Nelson, Richard R. & Winter, Sidney G., 1995.
"On the sources and significance of interindustry differences in technological opportunities,"
Research Policy, Elsevier, vol. 24(2), pages 185-205, March.
- Alvin K. Klevorick & Richard C. Levin & Richard R. Nelson & Sidney G. Winter, 1993. "On the Sources and Significance of Interindustry Differences in Technological Opportunities," Cowles Foundation Discussion Papers 1052, Cowles Foundation for Research in Economics, Yale University.
- Rebelo, Sergio, 1991.
"Long-Run Policy Analysis and Long-Run Growth,"
Journal of Political Economy, University of Chicago Press, vol. 99(3), pages 500-521, June.
- Sergio T. Rebelo, 1990. "Long Run Policy Analysis and Long Run Growth," NBER Working Papers 3325, National Bureau of Economic Research, Inc.
- Sergio Rebelo, 1999. "Long Run Policy Analysis and Long Run Growth," Levine's Working Paper Archive 2114, David K. Levine.
- Josh Lerner, 2002. "Patent Protection and Innovation Over 150 Years," NBER Working Papers 8977, National Bureau of Economic Research, Inc.
- David Andolfatto & Glenn MacDonald, 1998. "Technology Diffusion and Aggregate Dynamics," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 1(2), pages 338-370, April.
- Edwin Mansfield, 1986. "Patents and Innovation: An Empirical Study," Management Science, INFORMS, vol. 32(2), pages 173-181, February.
- Irwin, Douglas A & Klenow, Peter J, 1994. "Learning-by-Doing Spillovers in the Semiconductor Industry," Journal of Political Economy, University of Chicago Press, vol. 102(6), pages 1200-1227, December.
- Helios Herrera & Enrique Schroth, 2003.
"Profitable Innovation Without Patent Protection: The Case of Derivatives,"
FAME Research Paper Series
rp76, International Center for Financial Asset Management and Engineering.
- Helios Herrera & Enrique Schroth, 2003. "Profitable Innovation Without Patent Protection: The Case of Derivatives," Working Papers 0302, Centro de Investigacion Economica, ITAM.
- Josh Lerner, 2002.
"150 Years of Patent Protection,"
American Economic Review, American Economic Association, vol. 92(2), pages 221-225, May.
- Josh Lerner, 2000. "150 Years of Patent Protection," NBER Working Papers 7478, National Bureau of Economic Research, Inc.
- Josh Lerner, 2003. "150 Years of Patent Protection," Levine's Working Paper Archive 618897000000000587, David K. Levine.
- Hirshleifer, Jack, 1971. "The Private and Social Value of Information and the Reward to Inventive Activity," American Economic Review, American Economic Association, vol. 61(4), pages 561-574, September.
- Michele Boldrin & David K. Levine, 2009.
"A Model of Discovery,"
American Economic Review, American Economic Association, vol. 99(2), pages 337-342, May.
- Michele Boldrin & David K Levine, 2009. "A Model of Discovery," Levine's Working Paper Archive 814577000000000092, David K. Levine.
- Jayati Sarkar, 1998. "Technological Diffusion: Alternative Theories and Historical Evidence," Journal of Economic Surveys, Wiley Blackwell, vol. 12(2), pages 131-176, April.
- Nancy L. Rose & Paul L. Joskow, 1990.
"The Diffusion of New Technologies: Evidence from the Electric Utility Industry,"
RAND Journal of Economics, The RAND Corporation, vol. 21(3), pages 354-373, Autumn.
- Nancy L. Rose & Paul L. Joskow, 1988. "The Diffusion of New Technologies: Evidence from the Electric Utility Industry," Working papers 501, Massachusetts Institute of Technology (MIT), Department of Economics.
- Nancy L. Rose & Paul L. Joskow, 1988. "The Diffusion of New Technologies: Evidence From the Electric Utility Industry," NBER Working Papers 2676, National Bureau of Economic Research, Inc.
- Boldrin, Michele & Levine, David K., 2001.
"Growth Cycles and Market Crashes,"
Journal of Economic Theory, Elsevier, vol. 96(1-2), pages 13-39, January.
- Michele Boldrin & David K. Levine, 1999. "Growth Cycles and Market Crashes," Levine's Working Paper Archive 2028, David K. Levine.
- Michele Boldrin & David K. Levine, 2000. "Growth cycles and market crashes," Staff Report 279, Federal Reserve Bank of Minneapolis.
- Jovanovic, Boyan & Lach, Saul, 1989.
"Entry, Exit, and Diffusion with Learning by Doing,"
American Economic Review, American Economic Association, vol. 79(4), pages 690-699, September.
- Jovanovic, Boyan & Lach, Saul, 1988. "Entry, Exit, And Diffusion With Learning By Doing," Working Papers 88-16, C.V. Starr Center for Applied Economics, New York University.
- Funk, Peter, 2008. "Entry and growth in a perfectly competitive vintage model," Journal of Economic Theory, Elsevier, vol. 138(1), pages 211-236, January.
- Joseph M. Ostroy & Louis Makowski, 2001. "Perfect Competition and the Creativity of the Market," Journal of Economic Literature, American Economic Association, vol. 39(2), pages 479-535, June.
- Hannan, Timothy H & McDowell, John M, 1987. "Rival Precedence and the Dynamics of Technology Adoption: An Empirical Analysis," Economica, London School of Economics and Political Science, vol. 54(214), pages 155-171, May.
- Sarkar, Jayati, 1998. "Technological Diffusion: Alternative Theories and Historical Evidence," Journal of Economic Surveys, Wiley Blackwell, vol. 12(2), pages 131-176, April.
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- Michele Boldrin & David K Levine, 2007. "All the Interesting Questions, Almost All the Wrong Reasons," Levine's Working Paper Archive 784828000000000706, David K. Levine.
- Teng, Faxin & Meier, Claudia & Kamenev, Dmitry & Klein, Martin, 2011.
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- Teng, Faxin & Kamenev, Dmitry & Meier, Claudia & Klein, Martin, 2011. "Trade integration, restructuring and global imbalances: A tale of two countries," IAMO Forum 2011: Will the "BRICs Decade" Continue? – Prospects for Trade and Growth 16, Leibniz Institute of Agricultural Development in Central and Eastern Europe (IAMO).
- Tubadji, Annie & Nijkamp, Peter & Santarelli, Enrico, 2017. "Shacklean Uncertainty and Cultural Embeddedness as Innovation Constraints in the UK," GLO Discussion Paper Series 111, Global Labor Organization (GLO).
- José Ignacio Conde Ruiz & Juan Ramón García López & María Navarro, 2008. "Efectos de la Inmigración sobre Crecimiento Regional en España," Economic Reports 09-08, FEDEA.
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