在美联储引入量化宽松——买入大量长期债券,并承诺在相当长的时间内保持短期利率低位——之前,它已判定美国经济对2009年所实施的传统货币政策和财政刺激计划反应不够强烈。时任美联储主席伯南克(Ben Bernanke)认为非常规货币政策能降低长期利率,诱使投资者从高质量债券转移到股票和其他风险证券上。这将推高其他资产的价值,增加家庭财富,从而提振消费支出。


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