A Wisconsin law, the Unfair Sales Act, long required that retail gasoline be marked up at least 9.18% over wholesale price. When gas went over $4 a gallon in 2008, the law required the price to be increased at retail by 38 cents more a gallon. Flying J, which runs travel plazas, sued to contest the law, as it did not wish to mark-up its gas or diesel that much. The state contended that it was immune from antitrust actions. Was that position correct? Can a state mandate a price markup? [Flying J v. Van Hollen, 578 F.3d 569, 7th Cir. (2009)] '