Best of the Web Today: California Dreamin' - WSJ.com: "Further, merely signing up young people isn't sufficient to avoid adverse selection. You have to sign up young healthy people (healthy for obvious reasons, young because age is directly correlated with the likelihood of soon becoming sick).
A representative sample of young people will be healthy and likely to stay that way for some time. But there is no reason to expect that the self-selected sample of young people who've undertaken the effort and expense of signing up for ObamaCare is representative. Sick people of any age have the greatest incentive to sign up. And the smaller the sample, the likelier it is to be skewed by selection bias."
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