It seems that economics and logic were not the strong fields of protectionist nationalists in college---or at least this is the case with the three lieutenant governors who published an op-ed in The Hill at the beginning of the Summer. In the just-published Fall issue of Regulation (the electrons are still hot and the paper version has not yet hit the newsstands), I write: The USMCA, the authors glowingly wrote, will “increase U.S. annual agricultural exports by $2.2 billion.” This...