外生相对优势理论虽能解释国际贸易存在的原因，但不能解释国际贸易的扩张与增长。

Although exogenous relative advantage theory can explain the reason why international trade exists, it fails to explain its expansion and growth;

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为了追求相对的竞争优势，人们开始致力于寻找新的理论和研究方法，顾客感知价值理论就是在这样的背景下产生的。

In pursuit of the relative competitive advantage, people began to find new theories and research methods, and then the theory of customer perceived value is produced.

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为什么说自由贸易可以使大家普遍受益呢？这可以在所谓“相对优势”的理论中找到答案。

Why is free trade said to be universally beneficial? The answer is a doctrine called "comparative advantage".

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