In order for a
true free market to work, consumers need complete information to make an informed choice- including treatment options, success rates, costs, provider choices, insurance options. Healthcare is very complicated and it is impossible for consumers to be knowlegable on it. Not only that, they need access to all providers- which can be geographically limited. Maybe Bethesda is the best but they aren't in your state. Maybe Kaiser offers better services for what you need but aren't available to you. And no single provider will be best at everything so to have perfect choices one would have to look at different places for different problems. Nobody has the time and knowlege to do all of that.
It is perhaps ironic that our having many choices in insurance coverage in this country (selection may be zero or limited for the individual though) has led to higher medical costs. In the US, up to 40% of medical care costs are due to administration costs- processing all the different forms for all of the different insurance plans offered by all of the different insurance companies. In Canada, by comparison, administration costs only run about 16% of medical costs. Why? Single payer. One form to send to one location and not hundreds of different ones which require different documentation sent to different locations.
http://www.businessweek.com/article...alth-care-is-so-expensive-insurance-companies