Since even before Copperweld Corp. v. Independence Tube Corp., 467 U.S. 752 (1984), it has been thought that antitrust needs some "theory of the firm" to inform its application of a "single-entity" defense in Sherman Act section 1 litigation. Not only is that sense mistaken, it is emblematic of...

This paper attempts to formalize the transaction cost theory of the firm. Building on the formal approach of Grossman and Hart (1986), a model is developed to capture the essential elements of the transaction cost theory, particularly those that are distinct from the formal property rights...

A major consequence of the Internet era is the emergence of complex “platforms” that combine technology and process in new ways that often disrupt existing industry structures and blur industry boundaries. These platforms allow easy participation that often strengthens and extends network...

While price-fixing on platforms can attract severe enforcement action, as shown by the Amazon poster case, a more nuanced picture emerges regarding the fixing of prices for sellers by sharing economy platforms. This paper explores possible antitrust responses to such centralised platform-driven...