Wal-Mart operates 8,000 stores across three business segments of
retail stores worldwide that offer a wide array of general merchandise
including groceries, apparel, electronics, and small appliances. In
addition, the company is the world's largest retailer and grocery
chain by sales and just over half of the company's sales comes from
grocery items.
Over 54% of the company's stores are located in the United States
Wal-Mart's main customer base has an average annual income of $35,000,
versus the overall U.S. median of $50,303
Source:
http://www.wikinvest.com/stock/Wal-Mart_(WMT)