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. Transcripts of our podcasts are available via economist.com/podcasts. Listen to what matters most, from global politics and business to science and technology—subscribe to Economist Podcasts+. For more information about how to access Economist Podcasts+, please visit our FAQs page or watch our video explaining how to link your account.