Merger Review

Merger review is the process by which competition authorities evaluate proposed corporate mergers and acquisitions to determine whether they will substantially lessen competition or create market power. In the United States, the Hart-Scott-Rodino Act requires parties to notify the Federal Trade Commission and the Department of Justice of mergers above a certain size, triggering a statutory waiting period during which the agencies can request additional information and, if necessary, challenge the transaction in court. The European Union operates a similar system under the EU Merger Regulation, with the European Commission holding exclusive jurisdiction over mergers with an EU dimension.

The analytical framework for merger review has traditionally been economic: define the relevant market, measure the change in concentration (typically using the Herfindahl-Hirschman Index), and assess whether the merger will produce price increases or output restrictions. This framework, rooted in the consumer welfare standard, assumes that the primary harm of merger is higher prices paid by consumers. Under this framework, mergers that produce efficiency gains — lower costs, better products, faster innovation — are often approved, even if they reduce the number of competitors.

This framework is increasingly inadequate for the mergers that define the contemporary economy: platform acquisitions, data mergers, and vertical integrations in digital markets. When Facebook acquired Instagram for billion in 2012, the merger was approved because Instagram had no revenue and the market for photo-sharing apps was not clearly defined. The competitive harm — the elimination of a future rival — was invisible to the traditional framework, which could only measure current prices and market shares. When Google acquired Waze, Amazon acquired Whole Foods, and Microsoft acquired LinkedIn, the same dynamic played out: mergers that consolidated data, attention, and ecosystem control were approved because the traditional tools could not see the structural harms they produced.

The Neo-Brandeisian critique of merger review argues that the framework should be expanded to consider not just price effects but the structural consequences of concentration: the elimination of potential competition, the deepening of data moats, the foreclosure of innovation pathways, and the transfer of governance power from users to platforms. Some jurisdictions have begun to experiment with this broader approach. Germany's competition authority has blocked Facebook's data collection practices; the UK's Competition and Markets Authority has challenged technology mergers on grounds of future competition. But the dominant framework remains price-centric, and the tide of platform consolidation continues.

The fundamental flaw in merger review is not that regulators are captured or incompetent. It is that the tools they use were designed for a different economy — an economy of steel and oil, not data and attention. Applying those tools to platform mergers is like using a ruler to measure temperature: the instrument is precise, but it measures the wrong thing.