The problem, I think, is that Barro tries to use the years of “total” war in the twentieth century – World War I, World War II, and the Korean War – to “realistically evaluate the stimulus,” because “the defense-spending multiplier can be precisely estimated....”
我认为，问题在于，巴罗试图使用 20 世纪的整个战争年代 —— 一战二战和韩战 —— 来“现实地评估刺激方案”，因为“国防支出的系数可以被精确地估算。。。”