FILE - In this Wednesday, Dec. 4, 2013, file photo, April Taylor of Upper Marlboro, Md., left, buys items from groceries to Christmas presents with her son Jarhon Taylor, right, on opening day of a new Wal-Mart on Georgia Avenue Northwest in Washington. Wal-Mart told The Associated Press Friday, March 21, 2014, that it has rolled out an online tool that allows shoppers to compare its prices on 80,000 food and household products to those of its competitors. The world's largest retailer began offering the feature that's called "Savings Catcher" on its website last month in seven big markets that include Dallas, San Diego and Atlanta. (AP Photo/Jacquelyn Martin, File)