Medicare has 30 million patients and costs about 3% of gdp. Multiply by 10, and you would need to almost double the tax-base to pay for medicare. I propose the

Medicare has 30 million patients and costs about 3% of gdp. Multiply by 10, and you would need to almost double the tax-base to pay for medicare. I propose the other thought experiment: why doesnt medicare just compete in the market with other insurance plans: it charges X and provides the service. If its truly more efficient it will beat all the rest.