Well, someone else in this thread claimed that the root of the problem was CVS and Walgreens operating in an "unregulated free market". Sounds like maybe the m

Well, someone else in this thread claimed that the root of the problem was CVS and Walgreens operating in an "unregulated free market". Sounds like maybe the market has regulation, but it's shaped to benefit incumbents. I would guess that regulation is the main cause of the duopoly. I don't see anything obvious about the structure of the industry that should push it towards just a few major players, except the presence of regulation.