Under the ACA, health insurance marketplaces, also called health exchanges, were set up to facilitate the purchase of health insurance in each state. Customers are free to choose from a set of standardized healthcare plans from participating insurers, and those policies are eligible for federal subsidies.

But insurers have been fleeing the exchanges, arguing that they are loss makers and the types of people attracted to them make the risks too great for the insurers to provide affordable (and profitable) policies.

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