Karl Marx 's appraisal on David Ricardo 's " Doctrine of Comparative Cost "
十九世纪初,大卫.李嘉图提出了比较成本说,奠定了比较优势说在国际贸易中的理论基石地位。
In the early 19th century , David Ricardo put forward comparative cost theory and his most important contribution was the theory of comparative advantage .