Problem: The current structure of healthcare coverage in the U.S. has a combination of employer-based coverage, public program (e.g., Medicare, Medicaid) coverage and a large uninsured population. Suppose that a single-payer system is implemented where Medicare is expanded to cover all citizens. For those who prefer private insurance, there will be comparable coverage under the same range of private insurance plans already available. What do you think about allowing some people to purchase additional insurance, thereby creating a two-tiered health system based on affordability?