An illuminated Burger King sign is seen on August 25, 2014 in Washington, DC. Fast-food chain Burger King plans to buy Canadian chain Tim Hortons in an acquisition that will make it the world's third largest in the fast-food sector. As part of the deal, Burger King will move its headquarters to Canada where the company would benefit from Canada's more favorable tax code. AFP PHOTO/Mandel NGAN / AFP PHOTO / Mandel NGAN        (Photo credit should read MANDEL NGAN/AFP via Getty Images)