Although there are millions of options to choose from, Americans have their preferred soda brands, with Coca-Cola, Dr. Pepper, and Pepsi being among the most popular in terms of generated revenue. Related: PepsiCo makes surprising move with irresistible snack food brand PepsiCo is an American multinational food,

The Robinson-Patman Act was passed in 1936, but the federal government stopped enforcing it during the deregulation of the 1980s. The FTC resumed its enforcement in December when it sued Southern Glazer’s, the largest U.S. distributor of wine and spirits.

"Today's complaint against Pepsi is wholly deficient, not only because the pleadings fail to state a claim, but because the Majority rushed the case out the door before it had evidence to support the allegations,

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.

The FTC is suing PepsiCo for allegedly rigging the market by offering “unfair pricing advantages” that can contribute to inflation.

The US Federal Trade Commission sued PepsiCo Inc. Friday under a rarely invoked 1930s law called the Robinson-Patman Act that bars price discrimination against retailers.

According to the FTC’s complaint, Pepsi has been providing unfair pricing advantages to one of its largest customers—a major big box retailer—while raising prices for competing retailers and customers. Reuters reports that the retailer is none other than Walmart Inc. WMT , citing a source familiar with the discussions.

In the suit, the FTC said PepsiCo gave pricing advantages to one large chain but did not give those incentives to smaller retailers.