To retaliation, add pay-to-play — charging for access to the US market. High tariffs are fees for the privilege of peddling foreign wares in the world’s largest marketplace. Adjust when those partners offer billions in tribute for the president to invest in job creation in America. If necessary to meet the special needs of American companies, tweak the system, think Apple, or to satisfy some Trumpian whim, think Brazil. Messy, but so far not the disaster Trump’s critics have been predicting. One way or another, these tariffs or their close kin are here to stay, legitimised by any one of...