Textbook economics says a tariff should strengthen a country’s currency. Since the start of 2025, as US tariffs rose … and the dollar fell. In the first of four episodes of Voxtalks based on papers presented at the second Economic Policy: Papers on European and Global Issues conference, Alfonso Merendino (Bocconi University) and Tommaso Monacelli (Bocconi University, CEPR) tell Tim Phillips what they found when they looked for reasons. Their conclusion: for tariffs, it’s not size, it is how permanent people expect it to be. They call this structural trade policy uncertainty. When that uncertainty is low, a tariff behaves exactly as the textbook says. When it’s high, the same tariff can weaken the currency, shrink output and pull down inflation instead.



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