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A handful of digital platforms mediate a growing share of online commerce and communications. By structuring access to markets, these firms function as gatekeepers for billions of dollars in economic activity. One feature dominant digital platforms share is that they have inte­grated across business lines such that they both operate a platform and market their own goods and services on it. This structure places domi­nant platforms in direct competition with some of the businesses that de­pend on them, creating a conflict of interest that platforms can exploit to further entrench their dominance, thwart competition, and stifle innovation.

This Article argues that the potential hazards of integration by dominant tech platforms invite recovering structural separations. Separations regimes limit the lines of business in which a firm can engage, either by proscribing entry in certain markets or by requiring that distinct lines of business be operated through separate affiliates. Previously implemented both as a standard regulatory intervention and key antitrust remedy in network industries, structural separations have been largely abandoned. At the same time that lawmakers have weak­ened or eliminated sector-specific regulatory regimes, judicial interpre­tation of antitrust law has drastically narrowed the forms of vertical conduct and structures that register as anticompetitive. And when antitrust enforcers have targeted these forms of conduct and structures, they have applied remedies that generally (1) fail to target the under­lying source of the problem and (2) overwhelm the institutional capacities of the actors assigned to oversee them. Neglecting struc­tural remedies results in both substantive harms and institutional misalignments – effects that are especially pronounced in digital platform markets.

This Article seeks to give structural separations a seat back at the table. Tracing the history of separations reveals that they have been motivated by a host of functional goals, ranging from fair competition and system resiliency to media diversity and administrability. Recalling this broader set of concerns brings into focus the range of factors at stake when dealing with dominant intermediaries and invites consideration of the degree to which separations in platform markets would also respond to a diverse set of problems.


Antitrust and Trade Regulation | Banking and Finance Law | Business Organizations Law | Communications Law | Law | Legislation


This article originally appeared in 119 Colum. L. Rev. 973 (2019). Reprinted by permission.