It is more than three times larger, when measured in sales, than the next-largest retailer, Carrefour. (Carrefour has more stores.) Wal-Mart is the largest, or among the top three largest, sellers of many categories of goods, including groceries, family clothing, toys, personal care products, home electronics, magazines and others.

FORBES: Playing Hardball With Wal-Mart

Market research firm Euromonitor International tracks private-label spending in the core grocery products sectors, including food, beverages and personal care.

FORBES: Brand-New World