An employee talks on the phone at a Wal-Mart bank inside a S

MEXICO - JANUARY 25: An employee talks on the phone at a Wal-Mart bank inside a Sam's Club store in Curenavaca, Mexico, on Thursday, Jan. 24, 2008. Wal-Mart de Mexico SAB's bank unit, which started operations in November 2007, will introduce checking accounts, credit cards, payroll accounts and loans for small companies in 2008, and currently offers free savings accounts and personal credit for in-store purchases up to 50,000 pesos ($4,590). (Photo by Trevor Snapp/Bloomberg via Getty Images)