Will the 'Young Invincibles' Join Obamacare?

Megan McArdle weighs the costs and benefits of Obamacare for healthy young people.

It's no exaggeration to say that if young people don't show up to the insurance exchanges in the next few months, the Affordable Care Act probably won't survive. Young, healthy people paying more than they have previously -- either because they are buying more expensive insurance or because they are buying insurance for the first time -- are the financing mechanism that makes Obamacare's insurance markets work. The administration estimates that a little over a third of the people on the exchanges need to be in the 18-to-35 range to hold premiums down to reasonable levels.

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