Wal-Mart hasn't figured out how to sell a crucial product

Wal-Mart needs to revamp its grocery business. Groceries are vital to the retailer's success, accounting for 56% of its sales. But Wal-Mart's grocery department has been plagued by negative customer reviews, according to BMO Capital Markets analyst Wayne Hood. Customers complain about a lack of fresh produce, poor service, and empty shelves, Hood wrote in recent research note. "For it's size there is very limited variety," one customer complained on Yelp about a Richmond, Virginia. Wal-Mart. "Th...