I think it should be obvious why getting rid of Medicare and replacing it with coupons for old people to use to buy insurance is a bad idea, but in case it’s not, Paul Krugman has an explanation for you:

ear in mind that health expenses will still have to be mainly paid for by some kind of insurance; that’s in the nature of medical care, with its high but unpredictable cost. So what we’re doing here is replacing government insurance with a program that gives people money to buy private insurance — that is, adding an extra layer of middlemen. Why would this save money? I guess the answer is supposed to be the magic of the marketplace — but we have the experience of Medicare Advantage, plus studies of Medicaid versus private insurance, plus the raw fact that America relies more on private insurance than any other nation and also has by far the highest costs. Nothing, absolutely nothing, in the record suggests that this will do anything other than make health care less efficient.

And for those demanding documentation, it’s coming; too busy today.