Chinese consumers are becoming increasingly sophisticated in their tastes and expect a wider range of better products, according to a report released Monday that says local companies lead foreign ones in using e-commerce to expand sales. The report by the American Chamber of Commerce in Shanghai and the consultancy Booz & Co. says China will likely become the second-largest consumer market in the world by 2015, just trailing the United States. As their incomes grow, Chinese will have enough purchasing power to buy 14 percent of the world’s goods by 2015, up from 5 percent now, said the report, which surveyed 135 major consumer goods companies, 70 percent of them multinationals.