Megan McArdle, Columnist

A Scary Obamacare Mystery

To see Obamacare's gains, you have to look in the rear-view mirror.

Step right up.

Photographer: Joe Raedle/Getty Images
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Pop quiz: Are the Obamacare exchanges a success? Your answer should take into account three recent pieces of news about the online marketplaces created by the Affordable Care Act:

You may be wondering what these three seemingly disparate facts have to do with each other. The answer is, quite a lot. Let me explain.