By Brian Blase and Aaron Yelowitz

ObamaCare wasn’t supposed to give free health insurance to everybody. The Affordable Care Act’s authors expected the poor would enroll in Medicaid, while those with higher incomes would buy coverage through the new insurance exchanges, with subsidies that decrease as income rises.

It isn’t working. A study published this week by the National Bureau of Economic Research finds that in several Medicaid-expansion states most people who gained coverage have enrolled in Medicaid regardless of their income. In practice, ObamaCare…

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