The article does a good job of starting to explain the forces, but it's actually even more complicated. A number of the PBMs are cross invested in pharmacies and insurance companies, and the incentives of 2-3 large pharmacies that control the majority of the market (and how they get paid) is very different than how small pharmacies get paid. Additionally the way the generic market works vs the branded (patented) meds…
is that a euphemistic way of saying its a train-wreck, where society is hobbled by rent-seeking behavior by monopolist cartels that have used a combination of anti-competitive business strategy and regulatory capture to extract massive amounts of wealth from their captive audience of sick people?