Presidents of both parties have long required federal agencies to conduct benefit-cost analyses to weigh the likely positive and negative consequences of new regulations before they are issued. But during his first year in office, President Donald J. Trump presided over what his Office of Information and Regulatory Affairs (OIRA) administrator Neomi Rao has called a “fundamental shift.” Focusing on the negative consequences of regulations, President Trump directed agencies to reduce regulatory costs. By signing congressional resolutions, he rescinded 15 recent regulations before they went into effect. He also ordered agencies to modify or remove other existing regulations, and his agencies have dramatically slowed the pace of new regulatio...