Because market definition is frequently outcome determinative, it is both a central and contested part of antitrust litigation. Recognition of business methods known as multisided platforms presents the challenge of whether and how to incorporate their characteristically interconnected groups...

Analysis of efficiency in legal fields from contracts to competition assumes that a consumer's demand depends on the price the consumer faces, not on the prices a firm charges other customers. This project provides evidence to the contrary. It examines how the phenomenon impacts the analysis of...