Creating a work can cost authors a lot, whereas copying a work costs others very little. Absent copyright, then, authors might find it discouragingly difficult to recoup the costs of creating fixed expressive works. Authors might then underproduce expressive works, and the public consequently suffer.
To avoid that policy tragedy, the Copyright Act empowers authors to control the reuse of their fixed expressive works. By selling those special statutory privileges, authors can offset their production costs. Thus does copyright arguably do what the common law allegedly cannot: ensure that the public enjoys an adequate supply of expressive works.
The benefits of copyright policy come at a price, however. Although it may cost a great deal to make the first copy of a fixed expression, it usually costs very little to make and distribute subsequent copies. Absent copyright protection, those works would constitute public goods. Copyright bars the public from freely enjoying the very goods labeled “public.” Instead, the Act vests copyright holders with the power to charge whatever the market will bear to escape liability for infringement. Though the monopoly rents that copyright holders thereby win allegedly provide a necessary stimulus to creativity, non-holders suffer the opportunity costs of losing cheap access to fixed expressive works. Most commentators thus understand copyright policy to aim at striking a balance between giving authors sufficient incentives to create expressive works and providing the public with adequate access to the works thereby created. [The figure below] illustrates that, the standard economic model of copyright policy.
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