Forbes Retail Contributing Writer Barbara Thau: Sam’s Club closings are a reflection on a changing retail landscape

Rosalind Brewer, president and CEO of Sam's Club, speaks during the annual Wal-Mart shareholders' meeting in Fayetteville, Ark., Friday, June 1, 2012. Wal-Mart Stores Inc. CEO Mike Duke said Friday that the retailer is committed to integrity in the wake of recent bribery allegations in Mexico. (AP Photo/April L. Brown)

Forbes Retail Contributing Writer Barbara Thau explains why Sam’s Club is closing 63 of its 600 or so stores. Barbara says that Walmart has shown growth in its online success.