With about 36,000 units in 110 countries, Yum Brands operates the largest quick-service restaurant system in the world, based on number of locations. The firm generates revenue through company-owned restaurants, franchise fees, and licensing arrangements. Its restaurant concepts include KFC (15,600 units), Pizza Hut (13,200 units), Taco Bell (5,800 units), Long John Silver's (1,100 units), and A&W (600 units). Yum generated $36 billion in system sales during 2008.