"Insurers have to decide now how much they'll charge next year.... The problem is that insurers don't know what their costs will be next year. So they're guessing. They're guessing who will enter the exchanges. They're guessing who will choose to buy their coverage. They're guessing whether healthy, young people will obey the individual mandate or pay the penalty. They're guessing what price they'll need to be competitive against other insurers, given differences in the networks, benefits, etc.... If they get it wrong by being too cheap, they'll lose money."

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