Amazon Forces Shipping Services on Sellers, Antitrust Suit Says

Amazon.com Inc. was hit with federal antitrust claims in Seattle by a consumer claiming the tech giant has gained a dominant position in the shipping and logistics market by rigging its algorithms to penalize third-party sellers not using its overpriced “fulfillment” services.

The lawsuit, filed late Monday, accuses Amazon of pressuring merchants into using its fulfillment services by making them a condition of accessing the “Prime badge” and “buy box” relied on for one-click shopping by 90% of the platform’s users.

“Faced with a choice between doing right by its customers or gaining market power in one of the many ...