We assume "perfect information" because that's what lets us create simply supply and demand functions. Obviously in the real world you rarely (if ever) have per

We assume "perfect information" because that's what lets us create simply supply and demand functions. Obviously in the real world you rarely (if ever) have perfect information—and we have models to deal with that—but healthcare has almost zero information. You either can't make a choice because you literally can't (only one provider in your area) or you can't make a choice because you don't have pricing information. So you can't maximize your own utility, because you don't know what options lead to that outcome. Just about the ONLY assumption that holds true in healthcare is that firms maximize profits. And, in a twist of irony, the only healthcare provider to provide information on pricing is Kaiser Permanente—which is a non-profit. Yeah, they still do maximize profits, but not for shareholders. So you could make the argument that healthcare as a whole meets exactly zero of the assumptions necessary for any kind of free market model to apply.