Retail outlets can be classified by their form of ownership, level of service, and type of merchandise line. The forms of ownership include independent retailers, corporate chains, and contractual systems that include retailer-sponsored cooperatives, wholesaler-sponsored voluntary chains, and franchises. The levels of service include self-service, limited-service, and fullservice outlets. Stores classified by their merchandise line include stores with depth, such as sporting goods specialty stores, and stores with breadth, such as large department stores.