Global free trade is about individual, not national, freedom—for consumers and producers who import raw materials, tools, and semi-finished products. Aside from its role as an aspect of personal liberty, free trade's efficiency benefits have been well-established since the early 19th century. In this respect, domestic and global trade are the same. Trade restrictions disrupt the productive process, making it less efficient and hence less beneficial to consumers. "All that a tariff can achieve," Ludwig von Mises wrote in Human Action, "is to divert production from those locations in which the...