A free market is denoted by the absence of intervention by government, price-setting monopoly, or other authority. Under what circumstances are these $500 aspirin being purchased? I have a strong suspicion that some sort of cartel is involved. If not, I'd be happy to supply the market for far less.
Cartel, like in a corrupt system, right? Maybe just what I've said?
If you can get in the healthcare industry in the US you'll be a genius. Or probably a criminal, there's no legal way to get out of the current status quo without government intervention.
I like the free market, but you're oversimplifying reality.
There's another explanation (among many) for $n aspirin, that is to cover shortfalls from public health program reimbursements. It's a similar story with life flights. Not exactly a problem borne out of the private market, unless you're arguing that government intervention is corrupt?
And expect corruption in the private system, too. There's no other explanation for $500 aspirins :-)