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throughline No. 171 September 1, 2026

FTC Sues Amazon For Secretly Charging Advertisers Full Bid Prices

An auction's payment rule determines how people bid: second-price makes honest bidding safe, first-price forces bidders to shade downward. The allegation is not simply overcharging — it is that advertisers kept bidding under second-price logic while being billed under first-price logic, so every bid in the system was computed for rules that no longer applied.

An auction's payment rule determines how people bid: second-price makes honest bidding safe, first-price forces bidders to shade downward. The allegation is not simply overcharging — it is that advertisers kept bidding under second-price logic while being billed under first-price logic, so every bid in the system was computed for rules that no longer applied.

On August 31, 2026 the FTC and 22 state attorneys general sued Amazon in the Western District of Washington, alleging it told advertisers it ran second-price auctions while secretly adding a surcharge that made them pay their own bid about 80% of the time.

Why it matters: More than 500,000 small and mid-sized businesses advertise on Amazon, where placement is effectively compulsory for anyone selling there, and the FTC contends the cost was largely passed on to consumers.

Date to watch: Late September 2026, when Amazon's response is due 21 days after service in the Western District of Washington.

Sources:

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