The Federal Trade Commission is suing Pepsi, alleging it has rigged competition by offering unfair pricing deals to a big retailer at the expense of smaller rivals, resulting in higher costs for shoppers.

The commission alleges that the retailer, whose name was redacted in the statement from commissioners, received “unfair pricing advantages” that were not made available to others.

A lawsuit filed by the Federal Trade Commission alleges that food and beverage maker PepsiCo engaged in illegal price discrimination by giving unfair price advantages to one big-box retailer.