This correlation is reinforced by the convergence hypothesis – the benchmark theory for estimating an economy’s potential growth rate – which states that a rapidly growing developing economy’s real growth rate will slow when it reaches a certain share of the per capita capital stock and income of an advanced economy. According to the economists Barry Eichengreen, Donghyun Park, and Kwanho Shin, that share is about 60% of America’s per capita income (at 2005 international prices).
趋同假说——估算一国经济潜在增长率的基本理论——认为快速增长的发展中经济体的实际增长率会在其人均资本存量和收入达到发达经济体的一定比例时出现放缓。这一假说加强了这一相关性。根据经济学家巴里·艾肯格林（Barry Eichengreen）、朴东炫（Donghyun Park）和康镐炫（Kwanho Shin）的研究，这一比例大约是美国人均收入的60%（以2005年国际价格计算）。