For some reason, achieving a level of investment that would generate full employment seems to require negative real (inflation-adjusted) interest rates, which is another way of saying that people have to be paid to invest. But in a world of low inflation and zero nominal interest rates, getting to the required negative real rate may be a challenge.
不知什么原因，获取达致完全就业的投资水平似乎需要实际负利率（排除通胀）才能实现，以致出现某种说法，认为必须先发钱给人们然后能产生投资。但在一个低通胀和零名义利率的世界上，达到所需的负实际利率其实较为困难。这也是拉里·萨莫斯（Larry Summers）引用埃尔文·汉森（Alvin Hansen）在1938年发表的一篇论文里提到的“长期性经济停滞”概念。。