One nation has a comparative advantage over another for a given

One nation has a comparative advantage over another for a given product when its opportunity cost for producing that product is less than that of its neighbor. Comparative advantage，then,is based on differences in relative , rather than absolute costs.
【正确答案】：如果一个国家的所生产的某一种产品,其机会成本比邻国低，那么就这种产品来说，同邻国相比就占有相对的优势。所以相对优势是以相对成本方面的差异为基础，而不是以绝对成本方面的差异为基础的。