作者：Johnson, Justin P.
作者单位：Cornell University
摘要：If consumer valuations change over time, then secondary-market frictions may raise monopoly profits and cause durability to be distorted away from the cost-minimizing level. A monopolist who favors such frictions overinvests in durability, but planned obsolescence instead may be preferred when market frictions exist but a monopolist wishes they did not. Evidence from the book market is presented.
作者：Fershtman, Chaim; Gandal, Neil
作者单位：Tel Aviv University
摘要：Knowledge spillovers are a central part of knowledge accumulation. The article focuses on spillovers that occur through the interaction between different researchers or developers who collaborate on different research projects. The article distinguishes between project spillovers and contributors' spillovers and between direct and indirect spillovers. The article constructs a unique data set of open source software projects. The data identify the contributors who work on each project and thus ...
