Evidence that low prices (and binding price ceilings) reduce the quantity supplied

"Low Medicaid payment rates—about half of what private insurers pay for primary-care services—discourage doctors from participating. A 2019 government report found that only 70% of providers accept new Medicaid patients, versus 90% for private coverage. The disparity is more pronounced for family-practice doctors and psychiatrists" (WSJ, Sep 2021).