It's a great price control. Great for the economy? Maybe not, but civil rights -- equal treatment under the law -- are integral aspects of societal governance. The constitutional principles that guarantee equality under the law are among the greatest improvements in the history of civilized society, and if we're going to abandon them for a market theory, that market theory has to provide for that equality. But the markets have shown that they don't account for all these concerns, and the fact that the ACA has price controls like the one you mentioned demonstrates the inadequacy of pure markets, not just the inefficiency of government. The stance that a stateless society can be Utopia is no different than the communist extremist ideals of a classless society. Both cherry pick what they want from history, and neither account for the necessary attributes of the other.

Besides, if the markets could account for equal treatment under the law, the Supreme Court would never have had to rule on any major civil rights issues because the markets would have already dealt with them. This is similar to how a lot of anti-government people claim Medicare is a mess and healthcare would be covered by the markets if only government allowed it to be so, yet they forget that government use to allow it to be so, and Medicare was created because the markets abandoned the elderly. And now the ACA has been made because the markets abandoned the sick or possibly-sick

It's ironic that many who deride equal treatment are those who forget the great good that the principle of equal treatment has done them. Equal treatment under the law is as much a constitutional principle as civil liberties like privacy.