Digital advertising remains a primary source of revenue for media companies. Yet the system that allocates that revenue is controlled by a small number of intermediaries that design the auctions, govern data flows, and determine access to demand. The central debate over behavioral advertising is often framed as a question of performance. The more consequential question is structural: who controls the ad infrastructure that decides how value is distributed?
Ad tech firms argue that behavioral tracking improves efficiency across the ecosystem. They maintain that it delivers more relevant ads, reduces wasted spending, and increases publisher revenue. The concern, however, is not simply whether tracking improves performance. It is whether, in a concentrated market, tracking reinforces the firms that control the infrastructure rather than delivering broad gains for advertisers, publishers, and consumers.
New research puts that debate to the test.
Economic Rationales for Regulating Behavioral Ads, by Pegah Moradi, Cristobal Cheyre, and Alessandro Acquisti, reviews economic evidence on behavioral advertising. The authors evaluate whether tracking delivers the efficiency gains intermediaries claim. They find that when a small number of firms control key parts of the system, behavioral advertising often strengthens those firms rather than delivering broad gains across advertisers, publishers, and consumers.
A federal judge reached a similar conclusion about market structure in United States v. Google LLC. The court ruled that Google unlawfully maintains monopoly power in key segments of the ad tech market. It found that Google’s control over both the publisher ad server and the ad exchange enabled it to entrench its dominance across multiple layers of the stack, restrict alternatives, and distort competition. The case now moves into a remedies phase that will determine whether structural or behavioral changes are required.
Together, the research and the ruling point to the same issue: control over infrastructure shapes outcomes in digital advertising.
Intermediaries capture a large share of revenue
The research examines how digital ad auctions allocate value as advertiser competition increases. As more advertisers bid to reach the same users, bidding pressure rises. The intermediaries operating those auctions capture a significant share of that incremental spending. Studies cited in the report show that dominant ad tech firms can take 30 percent or more of each advertising dollar that flows through the system.
The authors do not argue that advertising lacks value. They argue that who controls the trading systems strongly influences how that value is divided.
In the Google case, the court examines how control over publisher ad servers and exchanges affects competition. By maintaining dominance across multiple layers of the ad tech stack, Google gains the ability to influence pricing, auction mechanics, and access to demand. The court concludes that this structure harms competition. The ruling supports the conclusion that control over ad tech infrastructure plays a central role in shaping market outcomes.
Behavioral targeting and market adjustment
The report explains how behavioral targeting allows firms to group users based on data and earn more from certain audiences. It then examines whether this practice expands total value in the market or mainly shifts revenue among advertisers, publishers, intermediaries, and consumers. The authors find limited evidence that tracking consistently produces substantial new gains across the ecosystem.
This finding shapes the debate over privacy regulation. Critics argue that limiting tracking would damage innovation and eliminate free digital content. After reviewing evidence from GDPR and Apple’s App Tracking Transparency framework, the paper finds little support for predictions of market collapse. Digital advertising continues, firms adjust their strategies and markets adapt.
The report finds that when tracking declines, companies adapt. Competition shifts, but digital advertising and content remain in place.
Ad infrastructure determines outcomes
The debate over behavioral advertising comes down to two competing explanations. One holds that tracking improves ad performance and increases revenue across the ecosystem. The research challenges that claim. It shows that when a few firms control the data and auction systems, tracking often strengthens their market power rather than delivering broad gains.
The court’s ruling in United States v. Google LLC reflects the same concern. Its findings about monopoly power and harmful tying focus on how control over key ad tech systems can distort competition.
For premium publishers, this is not an abstract policy question. The rules of the system and who controls them shape outcomes. The federal ruling signals that the structure of digital advertising markets warrants continued scrutiny. As the remedies phase proceeds, changes could alter how value flows among advertisers, intermediaries, and publishers.
Market structure determines who sets the terms of pricing, how bids clear, and whether investment in trusted content is rewarded through open competition. Sustainable digital markets require competition, transparency, and balanced bargaining power. Strong markets reward content creation and innovation rather than control over infrastructure and data extraction. The research and the courts have made one thing clear: digital advertising has reached an important inflection point.
