China's yuan currency is gaining importance in international trade and investment and might ultimately challenge the U.S. dollar, European Central Bank Executive Board member Yves Mersch said on Wednesday. Speaking at a conference on the renminbi, or yuan, in Luxembourg, Mersch urged the Chinese government to continue reforming its economy and its financial sector because the yuan was taking the first steps towards establishing itself as an international investment currency. "If it can do so successfully, it might one day become a leading reserve currency," Mersch said in a text of a speech. "Due to the size of ... (full story)