Tying Arrangement Mercedes-benz of North America (MBNA) was the exclusive franchiser of Mercedes- Benz dealerships in the United States. MBNA's franchise agreement required dealerships to establish a customer service department for the repair of Mercedes-Benz automobiles and required dealers to purchase Mercedes-benz replacement parts from MBNA. At least eight independent wholesale distributors, including Metrix Warehouse, Inc. (Metrix), sold replacement parts for Mercedes-Benz automobiles. Since they were precluded from selling parts to Mercedes-Benz dealers, these parts distributors sold their replacement parts to independent garages that specialized in Mercedes repairs. Metrix sold replacement parts for Mercedes-Benz automobiles of equal quality and at a lower price than sold by MBNA. Metrix sued MBNA, alleging a tying arrangement, in violation of Section 1 of the Sherman Act. Metrix won its case