Started in 1927, 7-Eleven Inc. is one of the largest convenience store chains in the world. Located in Phoenix, Ariz., it has more than 39,100 stores in 16 countries. The store in the United States is spread between 2,400/3,000-square-feet of space and features about 2,500 different items. It sells approximately 60 million donuts and pastries per year. 7-Eleven Inc. offers customers a wide range of products, such as USA Today newspapers, cold beer, single-serve bottled water, Gatorade and hot dogs, to name a few.