Vertical price-fixing
From Conservapedia
Vertical price-fixing consists of a manufacturer or wholesaler setting a minimum price for its goods to be sold by a retailer. This is also known as "resale price maintenance" (RPM).
This practice was automatically ("per se") illegal until June 28, 2007, when the U.S. Supreme Court said that a manufacturer or wholesaler may be able to justice its imposition of a minimum resale price.[1]
A decade earlier the U.S. Supreme Court legalized, if justification is shown, the practice of vertical price-fixing to establish a maximum resale price by retailers.[2]