Half of all U.S. primary household shoppers visit a Wal-Mart store on a monthly basis according to the “Wal-Mart Shopper Update” by Retail Forward, Columbus, OH. Wal-Mart shoppers are also frequent and loyal shoppers. “While Wal-Mart has successfully covered mainstream America with its value-orientation and the one-stop shopping convenience of its Supercenter model, key differences in shopper profiles and attitudes exist across categories,” said Sandy Skrovan, Retail Forward vice president and m...