Final answer:
Bartering is the method that is no longer popular in paying for health care services, as cash payments, credit cards, and health insurance are more common in modern systems. Insurance models, adverse selection, moral hazard, and cost-sharing mechanisms like deductibles play significant roles in the current health care landscape.
Step-by-step explanation:
The method of bartering is no longer a popular way of paying for health care services. In modern health care systems, especially in the United States, typical methods of payment include cash payments, credit cards, and most predominantly, health insurance. Health insurance can be provided through various models including fee-for-service systems or health maintenance organizations (HMOs). With the rise of insurance, adverse selection, and moral hazard concerns in the health care market, bartering has become an impractical and virtually obsolete method of transaction for medical services.
How to fix the expensive and dysfunctional American health care system remains a complex issue, with various political perspectives on insurance and individual responsibility. Cost sharing through deductibles and copayments has been found to reduce the amount of health care consumed, potentially mitigating moral hazard, without necessarily affecting health status outcomes significantly.