The vision of primary care as the foundation for all health care is one shared by many who work in and around the U.S. health care system. Patients, policymakers, providers, payers and purchasers generally agree that primary care promotes better health for populations through care that is built on trusted relationships. The National Academies of Sciences, Engineering, and Medicine (NASEM) wrote this year in a major report on primary care that investment in primary care has the power to improve health equity more than investment in any other part of our health care system, as well as to lower total system costs in the long term.