什么是“比较优势原理”？哪位来阐释一下，或给出一个定义？

顾此即失彼，顾此的成本就是失彼，而失彼最少的顾此就是你的比较优势

...楼上的解释真好玩

晕，经济学门外汉都知道。

我有英文版的定义：
comparetive advantage refers to the degree of advantage. Country A can have an absolute advantage over B in commodities X and Y. But if the degree of advantage of greater in X, we say that it has a comparative advantage in X, and comparative disadvantage in Y, The opposite is true for Country B.

难道是：生产同一个物品，我的成本比你低，因此我有比较优势？（我自己不太清楚。）