morris. caller: couple of questions. medicare, durable medical equipment, would eliminate a lot of the fraud. many years ago, when george bush was president, mikeevitt, head of hhs, wrote a piece about this, durable medical equipment. he was talking about oxygen concentrators. you can buy one for cash, $600, and medicare pays $200 a month for a three-year lease, and it still has not been fixed. address thesebody issues? is outrageous. guest: two interesting points. first, the one related to managed care, medicare advantage -- there has been a lot of analysis of whether the managed- care model is more cost- effective. much to the surprise of many, it does not save the medicare program much money. i don't agree have found a silver bullet yet, although we will keep looking for it. the other example of using -- the other issue of using the oxygen concentrator, for example, is that certain amount of money paid for something that if you went into a drugstore you could buy for a whole lot less. some of that is the antiquated way we price for services. some of that, to be very frank, is the powerful lobby in washington to make sure the status quo remai