第一轮QE毫无疑问利大于弊，因为它最小化甚至消除了2008年9月雷曼兄弟公司倒闭后全球萧条的尾部风险。
The first round of QE was unambiguously beneficial, because it minimized, or even eliminated, the tail risk of a global depression after the collapse of Lehman Brothers in September 2008.