PIIE Senior Fellow Chad P. Bown and Soumaya Keynes of The Economist focus this week on the costs of increased uncertainty generated by President Trump’s threat to rip up US trade agreements as well as the United Kingdom’s Brexit vote to leave the European Union. Professor Nuno Limão of the University of Maryland joins to discuss his recent research on how trade agreements reduce investment uncertainty and provides insight from Portugal’s 1986 entry to the European Community, China’s 2001 entry to the WTO, and lessons for policymakers today.