The fact that a larger market provides important gains in the form of a more intensive division of labor, and larger absolute size of the various specializations and sub specializations implies the desirability of worldwide free trade. Under worldwide free trade ever producer would be able to regard the entire world as his market. Production could be carried on in each locality on the vastly greater scale commensurate with a world market. Thus the division of labor could reach its maximum possible extent consistent with the existing size of the world’s population and the proportion of it already incorporated into the division of labor within the various national boundaries.
In reality, free trade with nations that do not have freedom ensures a form of labor slightly above slavery. And sometimes, actual slavery.
Free trade ensures that Indonesian slave labor fishing ships face no penalty when Indonesia sells the seafood. Free trade with nations that severely repress any attempt by workers to organize or to negotiate gives you Mexican and Asian factories with a hopeless wage.
If they complain, the factory can be moved to the next country with a teeming underclass. Its a race to the bottom.
The end of Most Favored Nation status in favor of Free Traitor agreements has ended our ability to effect changes in the behaviors of other nations. In fact, in the latest version Cruz brought us, other nations can demand that OUR laws be brought into line with their needs.
Adam Smith made one critical error. A nation with a culture matters to most people. It does not matter to business. Our founders were not idiots. And they selected tariff as THE method of financing government.