Combo photo taken on Sept. 1, 2014 shows people doing shopping at the Sanya Haitang Bay International Shopping Mall in Sanya, south China's Hainan province. The mall which opened on Monday is the world's largest duty free shop (DFS) with a business area of some 72,000 square meters. Offshore duty-free shopping in Hainan's two DFS stores in 2013, hit 3.29 billion yuan (530.6 million U.S. dollars), up 40 percent year on year. (Xinhua/Guo Cheng)