Copyright and Public Good Economics: a Misunderstood Relation
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Copyright and Public Good Economics: A Misunderstood Relation Christopher S. Yoo ABSTRACT The conventional approach to analyzing the economics of copyright is based on the premise that copyrightable works constitute pure public goods, which is generally modeled by assuming that such works are nonexcludable and that the marginal cost of making additional copies of them is essentially zero. These assumptions in turn imply that markets systematically produce too few copyrightable works and underutilize those that are produced. In this Article, Professor Christopher Yoo argues that the conventional approach is based on a fundamental misunderstanding. A close examination of the foundational literature on public good economics reveals that the defining characteristic of public goods is the need to satisfy an optimality criterion known as the “Samuelson condition,” which suggests that the systematic bias toward underproduction is the result of the inability to induce consumers to reveal their preferences rather than nonexcludability and zero marginal cost. Reframing the analysis in terms of the Samuelson condition also expands the number of ways in which the assumptions underlying pure public goods can be relaxed. In so doing, it suggests that markets for copyrighted works are more properly analyzed as impure public goods. Unlike markets for pure public goods, markets for impure public goods exhibit no systematic bias toward underproduction and are not bounded away from providing efficient levels of utilization. The insights of impure public goods theory thus have broad implications for a wide range of copyright-related issues, including fair use, duration, compulsory licenses, database protection, digital rights management, and derivative works. Introduction......................................................................................................................................1 I. The Conventional Approach to Applying Public Good Economics to Copyright.....................9 A. Nonexcludability..................................................................................................................9 B. Nonrivalry as Zero Marginal Cost .....................................................................................11 C. Applications of the Conventional Approach to Specific Copyright Doctrines..................16 1. Fair Use........................................................................................................................17 2. Duration .......................................................................................................................19 3. Compulsory Licenses...................................................................................................19 4. Database Protection.....................................................................................................21 5. Digital Rights Management .........................................................................................22 6. Derivative Uses............................................................................................................23 D. The Analytical Shortcomings of the Conventional Approach...........................................27 II. The Samuelson Condition as the True Foundation of Public Good Economics.....................30 A. The Baseline Case of Private Goods..................................................................................30 B. Pure Public Goods..............................................................................................................34 C. Critique of the Conventional Approach.............................................................................41 i 1. A New Perspective on Nonexcludability.....................................................................41 2. A New Perspective on Nonrivalry as Zero Marginal Cost ..........................................42 3. The Proper Scope of Price Discrimination ..................................................................43 III. The Theory of Impure Public Goods .......................................................................................46 A. The Economics of Congestion...........................................................................................49 1. A Basic Description of the Economics of Congestion.................................................49 2. The Applicability to Copyright....................................................................................56 B. Spatial Competition...........................................................................................................60 1. A Basic Description of Spatial Competition................................................................62 2. The Policy Implications of Spatial Competition for Copyright...................................67 a. The Feasibility of Promoting Optimal Access.......................................................67 b. The Feasibility of Optimal Incentives....................................................................71 3. Potential Limitations to Spatial Competition...............................................................80 IV. The Policy Implications of Applying Impure Public Goods Theory to Copyright.................83 A. Fair Use..............................................................................................................................83 B. Duration .............................................................................................................................85 C. Compulsory Licenses.........................................................................................................87 D. Database Protection...........................................................................................................88 E. Digital Rights Management ...............................................................................................89 F. Derivative Uses..................................................................................................................90 Conclusion .....................................................................................................................................93 ii Copyright and Public Good Economics: A Misunderstood Relation † Christopher S. Yoo INTRODUCTION Scholarship on the economics of copyright has been dominated by the assumption that copyrightable works are pure public goods.1 The most frequently cited definition of pure public goods focuses on two characteristics. First, pure public goods are nonexcludable, in that producers cannot provide their benefits to one consumer without simultaneously providing the benefits to other consumers. Second, pure public goods are nonrival, in that the consumption of † Professor of Law and Director of the Technology and Entertainment Law Program, Vanderbilt University Law School. I would like to thank participants at workshops conducted at the University of Michigan Law School and the Vanderbilt University Law School, as well as John Conley, Andy Daughety, Paul Edelman, Gerry Faulhaber, James Gibson, Paul Heald, Bob Inman, Mark Lemley, Glynn Lunney, Kristen Madison, Ted Parsons, Adam Pritchard, Bob Rasmussen, Jennifer Reinganum, Chris Sanchirico, Polk Wagner, and Joel Waldfogel, for comments on earlier drafts of this Article, and Catherine Sloan and Daniel Burks-Goodman for their research assistance. Financial support from the Vanderbilt Dean’s Fund is gratefully acknowledged. All errors are my responsibility. 1 See Ben Depoorter & Francesco Parisi, Fair Use and Copyright Protection: A Price Theory Explanation, 21 INT’L REV. L. & ECON. 453, 465 n.4 (2002) (calling the assumption that copyright is a pure public good “part of the collective wisdom of mainstream economic analysis”). For the seminal statement tying intellectual property to the theory of pure public goods, see Kenneth J. Arrow, Economic Welfare and the Allocation of Resources for Invention, in THE RATE AND DIRECTION OF INVENTIVE ACTIVITY: ECONOMIC AND SOCIAL FACTORS 609, 614-16 (Nat’l Bureau of Econ. Research ed., 1962). For leading examples within the copyright literature, see Stephen Breyer, The Uneasy Case for Copyright: A Study of Copyright in Books, Photocopies, and Computer Programs, 84 HARV. L. REV. 281, 281 (1970); William W. Fisher III, Reconstructing the Fair Use Doctrine, 101 HARV. L. REV. 1659, 1700-05 (1988); Wendy J. Gordon, Fair Use as Market Failure: A Structural and Economic Analysis of the Betamax Case and Its Predecessors, 82 COLUM. L. REV. 1600, 1610-11 (1982); William M. Landes & Richard A. Posner, An Economic Analysis of Copyright Law, 18 J. LEGAL STUD. 325, 326 (1989); Mark A. Lemley, The Economics of Improvement in Intellectual Property Law, 75 TEX. L. REV. 989, 994-99 (1997). For overviews of the economics of pure public goods, see RICHARD CORNES & TODD SANDLER, THE THEORY OF EXTERNALITIES, PUBLIC GOODS, AND CLUB GOODS 143-239 (2d ed. 1996); William H. Oakland, Theory of Public Goods, in 2 HANDBOOK OF PUBLIC ECONOMICS 485, 486-99, 502-22 (Alan J. Auerbach & Martin Feldstein eds., 1987). Of course, a wide range of noneconomic justifications for copyright also exist. See generally William Fisher, Theories of Intellectual Property, in NEW ESSAYS IN THE LEGAL AND POLITICAL THEORY OF PROPERTY 168, 170-73, 184-94 (Stephen R. Munzer ed., 2001). I leave extended discussion of copyright’s noneconomic aspects to other work. See Christopher S. Yoo, Copyright and Democracy: A Cautionary Note, 53 VAND. L. REV. 1933, 1953-63 (2000) (critiquing