Optimal copyright length and ex post investment: a Mickey Mouse approach

Adilov, Nodir and Waldman, Michael (2006): Optimal copyright length and ex post investment: a Mickey Mouse approach.

Abstract

This paper formally explores the optimal length of copyright protection when the value of an intellectual work changes over time due to depreciation and value-enhancing ex-post investments. The first main finding is that, in the case of a single project, granting infinitely-lived copyright protection maximizes social welfare when the return on ex-post investments is high relative to the return on the initial investment. We also provide simulation results of our model for the case of multiple heterogeneous projects that show how social welfare varies with the length of copyright protection and the returns on initial and ex-post investments. We then consider what our framework says concerning the social-welfare effects of the 1998 Copyright Term Extension Act. Here we show that, depending on the importance of ex-post investments, the act may have either increased or decreased social welfare. Our final analysis considers the social-welfare implications of replacing fixed-length copyright protection with Landes and Posner's (2003) idea of indefinitely-renewable copyright protection. We find that implementing indefinitely-renewable copyright protection frequently increases social welfare provided the returns on ex-post investments are sufficiently large. We also provide a brief history of Disney's Mickey Mouse and argue that the history of that character matches quite well with the predictions of our theoretical approach.

• Item Type: MPRA Paper
• Institution: Cornell University
• Language: English
• Keywords: Optimal copyright length; copyright term extension act
• Subjects: L - Industrial Organization > L5 - Regulation and Industrial Policy

References

Akerlof, G., et al., 2002, “Amicus Curiae Brief in Support of Petitioners in Eldred v. Ashcroft,” United States Supreme Court, May 20, No. 01-618.

Arrow, K., 1962, “Economic Welfare and the Allocation of Resources for Invention,” in The Rate and Direction of Inventive Activity: Economic and Social Factors, Universities – National Bureau Conference Series, Princeton University Press, Princeton, NJ.

Gilbert, R. and C. Shapiro, 1990, “Optimal Patent Length and Breadth,” The RAND Journal of Economics, 21(1):106-112.

Heide, R., J. Gilman, M. Peterson, and P. White, 2001, Mickey Mouse: The Evolution, The Legend, The Phenomenon, Disney Editions, New York.

Hirshleifer, J. and J. Riley, 1979, “The Analytics of Uncertainty and Information – an Expository Survey,” Journal of Economic Literature, 17(4):1375-1421.

Hollis, R. and B. Sibley, 1986, Walt Disney’s Mickey Mouse: His Life and Times, Harper &Row Publishers, New York.

Landes, W. and R. Posner, 2003, “Indefinitely Renewable Copyright,” University of Chicago Law Review, 70(2):471-518.

Liebowitz, S. and S. Margolis, 2005, “Seventeen Famous Economists Weigh in on Copyright: The Role of Theory, Empirics, and Network Effects,” Harvard Journal of Law and Technology, 18(2):435-457.

Nordhaus, W., 1969, Invention, Growth and Welfare. A Theoretical Treatment of Technological Change, The MIT Press, Cambridge, MA.

Novos, I. and M. Waldman, 1984, “The Effects of Increased Copyright Protection: An Analytic Approach,” Journal of Political Economy, 92(2):236-246.

Posner, R., 2005, “Intellectual Property: The Law and Economics Approach,” Journal of Economic Perspectives, 19(2):57-73.

Rappaport, E., 2002, “Copyright Term Extension: Estimating the Economic Values,” in John V. Martin (Editor), Copyright: Current Issues and Laws, Nova Science Publishers, Inc., New York.

Scherer, F., 1972, “Nordhaus' Theory of Optimal Patent Life: A Geometrical Reinterpretation,” American Economic Review, 62(3):428-430.

Stanley, A., 2006, “For Today’s Preschooler, A Slick New Mickey Mouse,” New York Times, May 5, p. E26.

Varian, H., 2005, “Copying and Copyright,” Journal of Economic Perspectives, 19(2):121-138.

Wasko, J., 2001, Understanding Disney: The Manufacture of Fantasy, Blackwell Publishers, Inc., Malden, MA.

Yuan, M., 2005. “A Better Copyright System? Comparing Welfare of Indefinitely Renewable Copyright Versus Fixed-Length Copyright,” mimeo, Gabelli School of Business, Roger Williams University.