Online Piracy and the “Longer Arm” of Enforcement
研究了供应侧执法（限制盗版供给）与需求侧执法（惩罚非法消费）对创新和福利的不同影响，发现供应侧执法长期经济效果更优，对制造商、消费者和政策制定者有启示。
Controlling digital piracy has remained a top priority for manufacturers of information goods, as well as for many governments around the world. Among the many forms taken by digital piracy, we focus on an increasingly common one—namely, online piracy—that is facilitated by torrent sites and cyberlockers who bring together consumers of pirated content and its suppliers. Motivated by recent empirical literature that makes a clear distinction between antipiracy efforts that restrict supply of pirated goods (supply-side enforcement) and ones that penalize illegal consumption (demand-side enforcement), we develop a simple economic model and discover some fundamental differences between these two types in terms of their impacts on innovation and welfare. All in all, supply-side enforcement turns out to be the “longer arm”—it has a more desirable economic impact in the long run. Our results have clear implications for manufacturers, consumers, and policy makers. The online supplement is available at https://doi.org/10.1287/mnsc.2017.2984 . This paper was accepted by Chris Forman, information systems.