By Merrill Goozner

The possibility that the Supreme Court will strike down all or part of the Affordable Care Act has given new life to Republican calls to put market mechanisms to work in holding down health care costs. The public is certain to hear lots more about it on the campaign trail later this year.

There’s one big problem, though. Markets cannot work when consumers and patients have almost no information about the prices they pay for health care.

Rep. Paul Ryan, R-Wis., chairman of the House Budget Committee, has resuscitated his proposal to turn Medicare over to insurance carriers. Future retirees would be offered financial help to pay for policies sold through public exchanges similar to the ones set up under the health care reform law, a.k.a. Obamacare. The subsidy would be limited to the value of the second-lowest cost plan offered on the market. The idea is that over-65 consumers, who would still have the option of remaining in traditional fee-for-service Medicare, would drive down costs by forcing the plans to compete for their business by offering lower-cost alternatives.

Other Republicans and conservative think tanks are touting laws that would allow insurance carriers to sell individuals policies across state lines, which would be coupled with incentives to shift people away from employer-based coverage. Under such plans, individuals could buy catastrophic coverage for expensive hospital stays while using the savings to pay the entire cost of routine health services, just like they pay out-of-pocket now for lawyers, flat-screen TVs or the week’s groceries.

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