Final answer:
Medicare is considered a cost-effective form of healthcare because it provides insurance primarily to people over sixty-five years old.
Step-by-step explanation:
Healthcare systems vary in terms of cost and effectiveness. In general, government-run healthcare systems, such as Medicare in the United States, offer insurance primarily to people over sixty-five years old. Medicare is considered a cost-effective form of healthcare because it provides coverage for a specific population, reducing the financial burden on individuals. However, it is important to note that the most cost-effective form of healthcare may vary depending on the specific context and needs of a population.