Since its incorporation in 1955, McDonald's Corporation has not only become the world's largest quick-service restaurant organization, but has literally changed Americans' eating habits--and increasingly the habits of non-Americans as well. On an average day, more than 46 million people eat at one of the company's more than 31,000 restaurants, which are located in 119 countries on six continents. About 9,000 of the restaurants are company owned and operated; the remainders are run either by franchisees or through joint ventures with local businesspeople. System wide sales (which encompass total revenues from all three types of restaurants) totaled more than $46 billion in 2003. Nine major markets--Australia, Brazil, Canada, China, France, Germany, Japan, the United Kingdom, and the United States--account for 80 percent of the restaurants and 75 percent of overall sales. The vast majority of the company's restaurants are of the flagship McDonald's hamburger joint variety. Two other wholly owned chains, Boston Market (rotisserie chicken) and Chipotle Mexican Grill (Mexican fast casual), along with Pret A Manger (upscale prepared sandwiches), in which McDonald's owns a 33 percent stake, account for about 1,000 of the units.…