This is from Paul Krugman:
And here’s what you need to know: Medicare actually saves money — a lot of money — compared with relying on private insurance companies. And this in turn means that pushing people out of Medicare, in addition to depriving many Americans of needed care, would almost surely end up increasing total health care costs.
The idea of Medicare as a money-saving program may seem hard to grasp. After all, hasn’t Medicare spending risen dramatically over time? Yes, it has: adjusting for overall inflation, Medicare spending per beneficiary rose more than 400 percent from 1969 to 2009.
But inflation-adjusted premiums on private health insurance rose more than 700 percent over the same period. So while it’s true that Medicare has done an inadequate job of controlling costs, the private sector has done much worse. And if we deny Medicare to 65- and 66-year-olds, we’ll be forcing them to get private insurance — if they can — that will cost much more than it would have cost to provide the same coverage through Medicare.