FILE PHOTO: A customer pushes her shopping cart through the aisles at a Walmart store in the Porter Ranch section of Los Angeles November 26, 2013. REUTERS/Kevork Djansezian/File Photo
FILE PHOTO: A customer pushes her shopping cart through the aisles at a Walmart store in the Porter Ranch section of Los Angeles November 26, 2013. REUTERS/Kevork Djansezian/File Photo