MEXICO CITY, MEXICO - APRIL 23:  Wal-Mart store signage is seen from the lot on April 23, 2012 in Mexico City, Mexico. According to reports, Wal-Mart de Mexico orchestrated a campaign of bribery to win market dominance by paying bribes to obtain permits in parts of the country. Wal-Mart Inc, along with two U.S. congressmen is conducting internal investigations over the allegations.  (Photo by Daniel Aguilar/Getty Images)