The central pillar of Trump’s economic plan is widespread tariffs on all imported goods, with penalties appearing to increase depending on how much he dislikes the country. Economists have warned that such a policy could have devastating effects on American consumers, who would be saddled with increased costs for all imported goods.

When questioned about the specifics of his plan, and if he was aware of its pitfalls, Trump seemed ignorant of basic economic principles, insisting that other countries, not American consumers, would pay for the tariffs.

Micklethwait tried to explain the actual impact. “Three-trillion worth of imports and you will add tariffs to every single one of them, and push up the cost for all of these people to buy foreign goods,” he said. “That is just simple mathematics.”