Trump’s Tariff PlanFew things attract more speculation than how President-Elect Donald Trump will model his plan to increase tariffs on imports. Some economists have taken his most exaggerated claims and predict they will cause slower economic growth and higher inflation. At least one advisor said Mr. Trump would follow the law in devising tariffs, presumably meaning he will use the Trade Act of 1974, which has protectionist provisions that at least conform to WTO procedures. This would be similar to current USTR Katherine Tai’s characterization that tariffs can have utility if crafted in a smart and strategic manner. And some members of Trump’s inner circle describe tariffs as leverage for negotiating concessions. Knowing that high pr...