Then there is the fact that correlation is not causation. In the case of Reinhart and Rogoff, the observation that highly indebted countries grow more slowly, even if true, does not tell us anything about whether high debt causes slow growth or vice versa.
而且事实上相关性并不等于因果性。在莱恩哈特和罗格夫的研究中，他们观察到高度债务国家经济增长得比较缓慢，即使这是真的，也不能告诉我们高负债会降低还是促进增长。