Infinity, it turns out, lasted a little more than two years. In September 2012, the US Federal Reserve administered one of the greatest market shocks of recent years by announcing it would buy $40bn of mortgage-backed securities every month (subsequently raised to $85bn, including Treasury bonds), and do so indefinitely.
事实证明，“无限期”持续了两年多一点的时间。2012年9月，美联储(Fed)实施了近年最大的市场冲击之一，宣布将每月购买400亿美元的抵押贷款支持证券（后来增至850亿美元，包括美国国债），而且会无限期地这么做。
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