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Japan's Shift From Process to Product Patents in the Pharmaceutical Industry: An Event Study of the Impact on Japanese Firms

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  • Sumner J. La Croix

    (Department of Economics, University of Hawaii at Manoa)

  • Akihiko Kawaura

Abstract

In 1976 Japan expanded the scope of its patent law by extending coverage to newly-developed chemical and pharmaceutical products. Previously the patent law had only provided protection to new production processes for manufacturing chemicals and pharmaceuticals. We use rate of return data from the Tokyo Stock Exchange for Japanese pharmaceutical companies to determine whether these firms gained from the introduction of pharmaceutical product patents. Using two different methodologies we find that the stock price for a portfolio of pharmaceutical firms and for individual firms significantly increased in response to the passage of the 1975 patent law.
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Suggested Citation

  • Sumner J. La Croix & Akihiko Kawaura, 1991. "Japan's Shift From Process to Product Patents in the Pharmaceutical Industry: An Event Study of the Impact on Japanese Firms," Working Papers 199118, University of Hawaii at Manoa, Department of Economics.
    • Handle: RePEc:hai:wpaper:199118
    Note: To request a hard copy of this paper, please email the department at econ@hawaii.edu.
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    References listed on IDEAS

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    1. Jarrell, Gregg A & Poulsen, Annette B, 1989. "Stock Trading before the Announcement of Tender Offers: Insider Trading or Market Anticipation?," The Journal of Law, Economics, and Organization, Oxford University Press, vol. 5(2), pages 225-248, Fall.
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    5. Gultekin, Mustafa N. & Gultekin, N. Bulent, 1983. "Stock market seasonality : International Evidence," Journal of Financial Economics, Elsevier, vol. 12(4), pages 469-481, December.
    6. Kato, Kiyoshi & Schallheim, James S., 1985. "Seasonal and Size Anomalies in the Japanese Stock Market," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 20(2), pages 243-260, June.
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    Cited by:

    1. Jörg Mahlich, 2010. "Patents and performance in the Japanese pharmaceutical industry: An institution-based view," Asia Pacific Journal of Management, Springer, vol. 27(1), pages 99-113, March.
    2. Ming Liu & Sumner LaCroix, 2011. "The Impact of Stronger Property Rights in Pharmaceuticals on Innovation in Developed and Developing Countries," Working Papers 201116, University of Hawaii at Manoa, Department of Economics.
    3. Ming Liu & Sumner la Croix, 2013. "A Cross-Country Index of Intellectual Property Rights in Pharmaceutical Innovations," Working Papers 201313, University of Hawaii at Manoa, Department of Economics.
    4. Sumner J. La Croix & Denise Eby Konan, 2002. "Intellectual Property Rights in China: The Changing Political Economy of Chinese–American Interests," The World Economy, Wiley Blackwell, vol. 25(6), pages 759-788, June.
    5. Gamba, Simona, 2017. "The Effect of Intellectual Property Rights on Domestic Innovation in the Pharmaceutical Sector," World Development, Elsevier, vol. 99(C), pages 15-27.
    6. Sumner La Croix, 1994. "Korea's Shift from Process to Product Patents in the Pharmaceutical Industry: An Event Study of the Impact of American Pressure on Korean Film," Working Papers 199402, University of Hawaii at Manoa, Department of Economics.
    7. Nahoko Mitsuyama, 2013. "Stock Market Reaction to Patent Value in Japan: an Event Study Analysis," Journal of Knowledge Management, Economics and Information Technology, ScientificPapers.org, vol. 3(6), pages 1-12, December.

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