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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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Bibliographic Info

Paper provided by University of Hawaii at Manoa, Department of Economics in its series Working Papers with number 199118.

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Date of creation: 1991
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Handle: RePEc:hai:wpaper:199118

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References

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  1. Chalk, Andrew, 1986. "Market Forces and Aircraft Safety: The Case of the DC-10," Economic Inquiry, Western Economic Association International, vol. 24(1), pages 43-60, January.
  2. Keim, Donald B., 1983. "Size-related anomalies and stock return seasonality : Further empirical evidence," Journal of Financial Economics, Elsevier, vol. 12(1), pages 13-32, June.
  3. Fama, Eugene F, et al, 1969. "The Adjustment of Stock Prices to New Information," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 10(1), pages 1-21, February.
  4. Jarrell, Gregg A & Poulsen, Annette B, 1989. "Stock Trading before the Announcement of Tender Offers: Insider Trading or Market Anticipation?," Journal of Law, Economics and Organization, Oxford University Press, vol. 5(2), pages 225-48, Fall.
  5. 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(02), pages 243-260, June.
  6. Gultekin, Mustafa N. & Gultekin, N. Bulent, 1983. "Stock market seasonality : International Evidence," Journal of Financial Economics, Elsevier, vol. 12(4), pages 469-481, December.
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Cited by:
  1. Sumner La Croix & Denise Eby Konan, 2002. "Intellectual Property Rights in China: The Changing Political Economy of Chinese-American Interests," Economics Study Area Working Papers 39, East-West Center, Economics Study Area.
  2. 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 12, December.
  3. 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.
  4. 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.

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