Under the theory of moral hazard, it is postulated that insured people overuse health care services and that patients themselves are a leading cause of health care inflation. If they would just have more "skin in the game" through enough cost-sharing (co-payments, deductibles and other restrictions), it is assumed that costs could be reined in. Instead of cutting health care spending, cost-sharing leads many patients to delay or forego necessary health care, resulting in later diagnosis of illness and higher costs down the road, together with decreased quality and outcomes of care. Overall health care costs are not reduced. Cost-sharing just shifts more costs to patients and families at a time when these costs are already unbearable for many.
Despite the widespread and increasing use of cost-sharing over many years, health care inflation remains completely out of control. Physicians push the buttons for health care services much more than patients.