那些高度依赖新凯恩斯主义理论的中央银行（更不用说立法者）都忽视了过往几十年货币政策实验的一个重要教训：对货币政策效果的预测是无法实现高度确定性或准确性的。
Central banks (not to mention lawmakers), with their strong attachment to neo-Keynesian theory, are ignoring a major lesson from decades of monetary-policy experimentation: the impact of monetary policy cannot be predicted with a high degree of certainty or accuracy.