Do you remember Donald Trump’s trade war? You can be forgiven for having forgotten all about it, given everything that has happened since; it sounds trivial compared with his effort to stay in power by overturning a fair election. Even in terms of policy while in office, it was far less important than his pandemic denial, and probably less important than his tax cuts or his sabotage of health care.

But the trade war was uniquely Trumpian. His other policy actions were standard-issue Republicanism, but the rest of his party didn’t share his obsession with trade deficits; indeed, he probably wouldn’t have been able to do much on that front except for the fact that U.S. law gives presidents enormous discretion when setting tariffs. Only Trump really considered trade deficits an important issue; and he, er, trumpeted what he called a “historic trade deal” under which China agreed to buy an additional $200 billion in U.S. goods and services by the end of 2021.

Now, Chad Bown of the Peterson Institute for International Economics, who has been the […]