We explore the logic of predation and rules designed to prevent it in markets subject to network effects. Although, as many have informally argued, predatory behavior is plausibly more likely to succeed in such markets, we find that it is particularly hard to intervene in network markets in ways...

We examine the effects of market structure and the internal organization of firms on equilibrium R&D projects. We compare a monopolist's choice of R&D portfolio to that of a welfare maximizer. We next show that Sah and Stiglitz's finding that the market portfolio of R&D is independent of the...

Many products--including microprocessors, telecommunications devices, computer software, and on-line auction services--make use of multiple technologies, each of which is essential to make or sell the product. The owner of one technology benefits from the existence of complementary technologies....