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Sergi Basco, Profesor Agregado de Economia, Universitat de Barcelona

How Trump’s renewed tariff chaos will stifle investment around the world

President Donald Trump on February 20, 2026, delivering remarks on the Supreme Court ruling on tariffs The White House Press Department

After the US Supreme Court ruled against President Trump’s import tariff measures, his first reaction (after harshly criticising the judges who ruled that he had exceeded his authority) was to announce another 10% global tariff. Shortly after, he threatened that the new US tariff would be 15% instead of 10%.

Officially, the only signed executive order says that President Trump imposes, “for a period of 150 days, a 10% ad valorem import duty on articles imported into the United States”. Given the volatility of the Trump’s Administration’s trade policy, it is all but impossible to predict, at least with any accuracy, what US tariffs will be when this period elapses.

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