Keynes and Bown describe how the Trump administration’s quotas imposed on steel imports from South Korea, Brazil, and Argentina are different from the simple application of tariffs. They speak with Ambassador Jennifer Hillman—former administrator of US quotas for textiles and apparel in the 1990s—and Aaron Padilla (American Petroleum Institute) to explain the structure of Trump’s quotas, the perverse economic incentives and unintended consequences they create, and the new difficulties facing American businesses.