Compared to countries with very slow growth rates, countries with reasonably high growth rates should borrow. But when a country’s growth rate continues to increase, its saving rate would increase faster than its investment rate, so it is more likely to run a current-account surplus.
一个可能的原因是，GDP增长率与一国经常项目状况之间的关系并不是线性的。与增长率极低的国家相比，增长率较高的国家应该举债。但若一国经济增长率继续增加，其储蓄率将以快于投资率的速度增长，因此更有可能产生经常项目盈余。