High levels of U.S. health-care spending and inadequate health outcomes make it vital for policymakers to explore opportunities for enhancing productivity in the health-care sector. However, the potential for these gains is sharply limited by anticompetitive policy barriers in the form of restrictive scope of practice laws imposed on physician assistants and advanced practice registered nurses. Adams and Markowitz examine evidence on the impacts of these restrictions, concluding that states should move to fully authorized scope of practice for these practitioners. The authors explore state and federal policies that could help facilitate this shift.