Amazon built one of the world’s biggest digital advertising machines. Now, the Trump administration’s Federal Trade Commission says the company used that enormous reach to quietly squeeze advertisers—and ultimately drive up costs for ordinary Americans.
The FTC, joined by 22 states, sued Amazon Monday, accusing the tech giant of secretly manipulating its advertising auctions to charge advertisers more than the system appeared to require.
According to the Wall Street Journal, the FTC’s complaint estimates that the practice cost advertisers more than $20 billion. The system reportedly began in 2018 and affected advertisements displayed when customers searched Amazon and its mobile app, including Sponsored Products, Sponsored Brands, and Sponsored Display placements.
The accusation centers on something deceptively simple: the price advertisers thought they were paying versus the price Amazon allegedly made them pay.
In a conventional auction, if one advertiser bids $15 and another bids $12, the winner might pay just above the second-highest bid—say, $12.01.
But the FTC says Amazon developed what employees internally called a “soft reserve” system that changed that calculation after the auction had already concluded.
The complaint describes these as “post-hoc pricing adjustments.” It also cites an internal acknowledgment that “[a]dvertisers may not be expecting” the additional adjustments.
That sentence may prove particularly important.
Because if customers and businesses are told one thing about how a marketplace works while the marketplace quietly operates another way, the issue is no longer just about sophisticated advertising technology. It becomes a question of transparency and trust.
The FTC says Amazon did not apply the practice to every auction, but alleges that it intervened in 70 to 80 percent of auctions in recent years. The complaint further says Amazon imposed an additional surcharge during the Christmas shopping season and other periods of peak demand.
In other words, the government alleges that the system became especially aggressive when businesses were under the greatest pressure to reach customers.
FTC Chairman Andrew Ferguson took the argument directly to the kitchen table.
The pricing practice, Ferguson wrote on X, “hit essential goods, like food and grocery items ordinary Americans rely on.”
That is where this case becomes bigger than Amazon's advertising business.
Digital advertising costs do not exist in a vacuum. When companies spend more to reach customers, those costs can eventually find their way into the prices consumers pay.
Amazon, which operates the world's third-largest digital advertising platform behind Google and Meta, rejected the government's case.
The company called the lawsuit “misguided” and said the FTC’s claims “fundamentally misunderstands how advertisers operate.”
That defense will now be tested in court.
The case also represents a broader challenge to the idea that America's biggest technology companies should be allowed to operate with rules ordinary businesses could never get away with. Markets work best when buyers and sellers can understand the terms—and when powerful intermediaries cannot quietly rewrite those terms behind the scenes.
For the Trump administration, that principle fits neatly into a broader agenda of corporate accountability and tougher scrutiny of Big Tech.
The message from Ferguson's FTC is straightforward: size is not a license to manipulate the marketplace.
Amazon may have the technology, the reach and the billions in advertising revenue. But if the government's allegations hold up, the company may also have to answer for a pricing system that advertisers did not fully see coming—and that the FTC says ultimately helped make everyday goods more expensive.
The American consumer should not need a Ph.D. in auction algorithms to know what they are being charged. Transparency is not too much to ask. It is the bare minimum in a functioning free market.
