Of course, in the absence of mobilization for WWII, it is possible and even likely that the Great Depression would have cast a shadow on post-1940 US economic growth. That is certainly how things looked, with high levels of structural unemployment and a below-trend capital stock, at the end of the 1930’s, before mobilization and the European and Pacific wars began in earnest.
而经济增长的长期趋势未被打断的例子只有一个：在二战后，美国的生产率和就业受到经济大萧条的明显影响。当然，如果不是投入人力参加二战，美国1940年后的经济增长很可能受到大萧条的严重冲击。结构性失业高企，资本储备低于常量，这就是1930年末美国动员参战和亚欧战事大规模爆发之前的真实情况，