Companies you've never heard of are making a killing off high drug prices

It's easy to see why EpiPen has become the focus of America's fury over drug prices. It treats potentially deadly allergic reactions — for example, in a child who is stung by a bee — and its price has spiked by over 500% in a few years.

While it's easy to jump all over drugmakers, like EpiPen's maker, Mylan, other actors in the healthcare system ought to draw as much scrutiny.

One group of companies, called pharmaceutical-benefit managers, or PBMs, serve as middlemen, and they touch every part of the purchase of a prescription drug.

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