type="main" <p>A question central to R&D policy making is the impact of competition on cooperation. This paper builds a theoretical foundation for the dynamics of knowledge sharing in private industry. We model an uncertain research process and ask how the incentives to license intermediate steps...</p>

This paper introduces a new model of exchange: networks, rather than markets, of buyers and sellers. It begins with the empirically motivated premise that a buyer and seller must have a relationship, a "link," to exchange goods. Networks--buyers, sellers, and the pattern of links connecting...