After months of bluster, he’s finally done it. At a ceremony in the White House Rose Garden, Donald Trump overturned decades of American trade policy with a simple signature. The new wave of trade restrictions, if implemented in full, will raise tariffs to the highest level in more than a century. So how bad could it get?

Hosts: Mike Bird and Ethan Wu. Guests: The Economist’s Simon Rabinovitch; and Douglas Irwin, a professor of economics at Dartmouth College.

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