ST. LOUIS COUNTY, MO - MAY 11:  Night settles in on a 24-hour Wal-Mart May 11, 2005 in St. Louis County, Missouri. Wal-Mart, America's largest retailer and the largest company in the world based on revenue, has evolved into a giant economic force for the U.S. economy. With growth, the company continues to weather criticism of low wages, anti-union policies as well as accusations that it has homogenized America's retail economy and driven traditional stores and shops out of business.  (Photo by Chris Hondros/Getty Images)
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