It can also be seen that the US was the biggest exporter of machinery, nuclear reactors and boilers. This is in line with the theory of comparative advantage that propounds that an economy should specialize in the production of that product in which it has a competitive advantage. In the terminology of economics, the basic propositions of the law of comparative advantage refer to the capability of an economy to produce a type of good/service at a comparatively lower marginal cost as well as opportunity cost in contrast to the other party. Unlike the theory of absolute advantage that directs the entire focus on the capability of the economy to manufacture a particular type of good in a manner that lowers the absolute cost in contrast to the other economy, the theory of comparative advantage highlights the fact that trade can lead to value creation for both the economies even in the scenario when one economy can manufacture products with fewer resources in comparison to the other. This is on account of the differing opportunity costs of the resources.
它也可以看出，我们的机器的最大出口国，核反应堆锅炉。这是在与比较优势理论，提出了一个经济应该专注于该产品的生产具有竞争优势的线。在经济学的术语，对比较优势理论的基本命题是指一个经济体的生产能力的一种良好/服务在一个较低的边际成本以及与对方的机会成本。不同的绝对优势，将全部的精力在经济能力的方式，降低了与其他经济的绝对成本制造好的特定类型的理论，比较优势理论集锦的事实，贸易会导致两个经济体创造价值，即使在情况下，一个经济可以制造到其他资源产品比较少。这是在不同的机会成本的资源帐户。
