I think Bob Hall has a better read on what is going on: &quot;With allowance for other factors holding back GDP growth during those wars, the multiplier linking government purchases to GDP may be in the range of 0.7 to 1.0... but higher values are not ruled out.... Multipliers are higher – perhaps around 1.7 – when the nominal interest rate is at its lower bound of zero, as it was during 2009...” (and is today).
我认为鲍 勃·豪尔的判断更为正确。“在战争年代，由于补贴抑制 GDP 增长，政府支出和 GDP 的比率大约在 0.7——1.0 范围。。。但是高系数也不是没有可能。。。当利率只有零时，系数就会较高 —— 约为 1.7 ，就像 2009 年出现的情况那样。。。”（现在也是如此。）