For many years, Sam's Club has trailed warehouse club leader Costco Wholesale (NASDAQ: COST) in terms of sales and profitability. Wal-Mart (NYSE: WMT) has finally admitted that the status quo isn't viable, and the company recently decided to close about 10% of the domestic Sam's Club fleet.In this episode of Industry Focus: Consumer Goods, Vincent Shen welcomes senior Fool.com contributor Adam Levine-Weinberg to the show as they investigate why Sam's Club is pulling back in the U.S.