BEIJING—China’s currency fell further Wednesday following a surprise change in its exchange rate mechanism that rattled global markets and threatens to fan trade tensions with the United States and Europe.
The central bank said the yuan’s 1.9 percent devaluation Tuesday against the U.S. dollar, which was its biggest one-day fall in a decade, was due to changes aimed at making the tightly controlled currency more market-oriented. That raised the prospect of still more declines, which would help struggling Chinese exporters at the expense of foreign competitors and might shore up flagging economic growth.





