Wal-Mart has spawned a cottage industry in books and articles about Wal-Mart stores and what’s wrong with them for America. Discussion varies among many topics but low wages and high turnover get plenty of attention. Allow me to quote from a 2009 addition to the list of Wal-Mart books: the Retail Revolution by Nelson Lichtenstein. note(1) A Wal-Mart exec is quoted: “It’s hard to believe but turnover drops millions of dollars to the bottom line in...