There is an increasing risk that the US economy has become trapped in a prolonged period of subdued growth that requires lower official rates than was previously expected, a leading Federal Reserve policymaker has warned.
美聯儲(Fed)一位主要政策制定者警告稱，美國經濟陷入長期低增長的風險日益增加，這要求官方利率比之前預計的更低一些。
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