HANGZHOU - "This crystal clock looks so nice, how much is it?" Kauthar Ding asked a shop owner in the Yiwu International Trade Market in Zhejiang Province. After finding out the price, she used her smartphone to relay the information to a client thousands of miles away. "It"s 115 yuan (about $18)," she said in Arabic. The Palestinian merchant shook his head. "It's a bit expensive," he said, and Ding moved to the next booth. Yiwu, China's small commodity hub, is widely known as the world's supermarket. This practice has become commonplace for those working in foreign trade since the