This Medscape article discusses the drawbacks to some physicians of working in a country with a single-payer health-insurance system.

One: “{L}ack of competition among payers, which would reduce physicians’ control over standards of care and reimbursement. In a multipayer system, doctors can choose which insurers to work with—even opting out of Medicare and Medicaid, as doctors are increasingly choosing to do. They couldn’t in a pure single-payer system.”

Another drawback of single payer: Most U.S. physicians, who are by far the highest paid in the world, might well take pay cuts.