诺贝尔经济学奖获得者萨缪尔逊（Paul Samuelson）在1948年观察到，国际贸易导致因素价格趋同，不同国家经技能水平调整的工资趋于均衡。
As the Nobel laureate economist Paul Samuelson observed in 1948, international trade leads to factor-price equalization, with wages, adjusted for skill levels, equilibrating across countries.