Walmart is the world's largest name in retailing. The big-box chain boasts more than 10,600 stores and clubs, which includes more than 4,600 Walmarts and nearly 600 Sam's Clubs in the U.S. But that ...

There's a lot of room for error—in particular, user error—at self-checkout. One shopper reacted to their own mistake at the self-checkout of their local Walmart store with a bold decision. They called ...