A lawsuit has been filed against Amazon, alleging the company deceived businesses. The lawsuit claims that advertisers were overcharged due to a change in the minimum price to place ads. This change was made without the advertisers' knowledge, resulting in extra costs for 1.2 million advertisers.

The lawsuit is the third major one filed against Amazon by the federal agency. Amazon's advertising system uses auctions, where companies bid on ad space. The issue lies in the payment system, where the winning bidder pays slightly more than the next highest bid.

Further details about the lawsuit and Amazon's advertising practices are available from the source, including a related story about the value of Amazon Prime.