Wal-Mart (WMT +1.00%) recently announced that it was adding lockers to many of its stores to enable same-day pickup of items ordered online. In this video, Fool contributor Chuck Saletta talks about how that strategy copycats one that Amazon.com (AMZN -1.87%) has already launched and notes that if Wal-Mart really wants to win, it needs to think leapfrog instead.