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.
事實證明，“無限期”持續了兩年多一點的時間。2012年9月，美聯儲(Fed)實施了近年最大的市場沖擊之一，宣布將每月購買400億美元的抵押貸款支持證券（后來增至850億美元，包括美國國債），而且會無限期地這么做。
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