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A man pushes a shopping cart after doing his grocery shopping in a supermarket on December 21, 2012 in Montesson, near Paris, a few days ahead of Christmas. AFP PHOTO / LIONEL BONAVENTURE (Photo credit should read LIONEL BONAVENTURE/AFP/Getty Images)

A man pushes a shopping cart after doing his grocery shopping in a supermarket on December 21, 2012 in Montesson, near Paris, a few days ahead of Christmas. AFP PHOTO / LIONEL BONAVENTURE        (Photo credit should read LIONEL BONAVENTURE/AFP/Getty Images)