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Life-cycle Productivity of Industrial Inventors: Education and other determinants

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  • ONISHI Koichiro
  • NAGAOKA Sadao

Abstract

This paper analyzes the life-cycle inventive productivity of Japanese industrial inventors, based on panel data of 1,731 inventors matched with firm data. We focus on two issues: whether inventors with PhD degrees perform better, even taking into account the late start in their business careers, and if those with PhD degrees based only on dissertation (PhDs (DO)), for which a university performs only a certification function, are similarly as productive as the regular PhD holders. Our main findings are the following. Inventors with regular PhD degrees have significantly higher annual productivity than those with other education levels in terms of both patent and forward citation counts, and they can easily compensate for the late start in their business careers. This is the case even after controlling for workplace, research stage, and inventor ability. PhDs (DO) also have high patent productivity (rising more rapidly with experience), although their level is lower than that of regular PhD holders. They work in independent laboratories and in projects involving basic research as frequently as do the regular PhD holders. Furthermore, the exits of PhDs (DO) from inventions are significantly late even when controlling for project type and inventor ability, so that they work longer as inventors.

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Paper provided by Research Institute of Economy, Trade and Industry (RIETI) in its series Discussion papers with number 12059.

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Length: 41 pages
Date of creation: Sep 2012
Date of revision:
Handle: RePEc:eti:dpaper:12059

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  1. Jacob A. Mincer, 1974. "Introduction to "Schooling, Experience, and Earnings"," NBER Chapters, in: Schooling, Experience, and Earnings, pages 1-4 National Bureau of Economic Research, Inc.
  2. Jeremy T. Fox & Valérie Smeets, 2011. "Does Input Quality Drive Measured Differences In Firm Productivity?," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 52(4), pages 961-989, November.
  3. Serneels, Pieter, 2008. "Human capital revisited: The role of experience and education when controlling for performance and cognitive skills," Labour Economics, Elsevier, vol. 15(6), pages 1143-1161, December.
  4. Schettino, Francesco & Sterlacchini, Alessandro & Venturini, Francesco, 2008. "Inventive Productivity and Patent Quality: Evidence from Italian Inventors," MPRA Paper 7765, University Library of Munich, Germany.
  5. Sangjoon Lee & Jinyoung Kim, 2004. "Research Scientist Productivity and Firm Size: Evidence from Panel Data on Inventors," Econometric Society 2004 Far Eastern Meetings 465, Econometric Society.
  6. MORIKAWA Masayuki, 2011. "Postgraduate Education and Human Capital Productivity in Japan (Japanese)," Discussion Papers (Japanese) 11072, Research Institute of Economy, Trade and Industry (RIETI).
  7. John P. WALSH & NAGAOKA Sadao, 2009. "Who Invents?: Evidence from the Japan-U.S. inventor survey," Discussion papers 09034, Research Institute of Economy, Trade and Industry (RIETI).
  8. Mariani, Myriam & Romanelli, Marzia, 2007. ""Stacking" and "picking" inventions: The patenting behavior of European inventors," Research Policy, Elsevier, vol. 36(8), pages 1128-1142, October.
  9. Hoisl, Karin, 2006. "Tracing Mobile Inventors – The Causality between Inventor Mobility and Inventor Productivity," Discussion Papers in Business Administration 1260, University of Munich, Munich School of Management.
  10. Jacob A. Mincer, 1974. "Schooling, Experience, and Earnings," NBER Books, National Bureau of Economic Research, Inc, number minc74-1, octubre-d.
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