FILE - In this April 13, 1985, file photo, a human river of Sunday shoppers courses down Wangfujing Street in Beijing. In the early 1980s, as China's own economy began to open up to trade and investment after decades of Cold War isolation and political upheavals, the contrast between the mainland and Hong Kong was evident on crossing the border into the bucolic rice paddies and fish ponds of Shenzhen. (AP Photo/Neal Ulevich, File)