In a July 20th editorial, the Wall Street Journal offered this pithy appraisal of one of the Trump administration’s top economic advisers on the negative consequences of the burgeoning U.S. trade war with the rest of the world: “Peter Navarro says the harm is a ‘rounding error.’ He’s out of touch.” Navarro is an economist and director of the Office of Trade and Manufacturing Policy (OTMP), a White House agency created by President Trump. He is one of the rare economists to occupy a high-level advisory role in the White House. A Harvard University Ph.D., he is a stiff protectionist, which is...