Walmart's highest selling product says a lot about its business

Reuters/Guillermo Granja Wal-Mart Stores' best-selling product isn't something you'd probably guess. The world's largest retailer may be best-known for selling $2 t-shirts, cheap toys from China, and pretty much everything else under the sun, but its most popular product is something more mundane. It's the most popular fruit in the country -- the banana. Wal-Mart sells more than 1 billion pounds of the tropical fruit every year. Bananas are generally known as the cheapest food in the grocery st...