Amazon accused of rigging billions in ad auctions

The US government alleges Amazon rigged ad prices worth 20 billion dollars, according to a lawsuit now joined by California. The BBC reports the figure at 20 billion; the Independent describes the auctions as worth billions and characterises the alleged conduct as rigging.

The case concerns Amazon's ad marketplace, where sellers bid to promote products on the platform. California joined the existing federal lawsuit, broadening the geographic and political reach of the claim. The allegation is that Amazon manipulated auction outcomes to extract higher prices from advertisers than a competitive market would produce.

Amazon operates both the marketplace and the auction - it sets the rules, runs the bidding, and collects the revenue. That vertical integration is legal, but it creates the opportunity for self-dealing. The government's claim rests on whether Amazon used its control of the platform to rig the outcomes rather than let the market clear. If the allegation stands, the remedy could force Amazon to divest its ad business or operate it under external oversight, cutting into one of the company's fastest-growing revenue streams.

The next stage is discovery - internal emails and pricing algorithms will show whether Amazon's engineers designed the system to maximise revenue or to simulate a competitive auction. That distinction is the entire case.