Faltering confidence in the US dollar has handed China a “golden window of opportunity” to promote the global use of its currency, according to a former head of the Chinese central bank. “The core driving force behind the current changes in the international monetary system is the United States’ own policy choices,” Zhou Xiaochuan was quoted as saying in a report published on Sunday by the New Economist, a Chinese think tank. He cited the broad application of American tariffs, the frequent use...