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. This Article seeks to give structural separations a seat back at the table. Neglecting structural remedies results in both substantive harms and institutional misalignments-effects that are especially pronounced in digital platform markets. 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. 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. Previously implemented both as a standard regulatory intervention and key antitrust remedy in network industries, structural separations have been largely abandoned. 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. This Article argues that the potential hazards of integration by dominant tech platforms invite recovering structural separations. 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. 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. By structuring access to markets, these firms function as gatekeepers for billions of dollars in economic activity. A handful of digital platforms mediate a growing share of online commerce and communications.
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