Consumers say Amazon has unfairly increased the costs of goods by disallowing its merchants from offering lower prices on other marketplaces.

A federal judge ruled that Amazon must face a class action lawsuit accusing the e-commerce giant of imposing inflated fees on third-party sellers that have been passed along to consumers. U.S.

Amazon.com must face a class action on behalf of hundreds of millions of U.S. consumers over claims that the online retail ...