medication costs

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Jane Morse needed to fill a prescription that was going to cost her about $300. She's on Medicare but doesn't have a prescription drug plan so she's learned to shop around.

Steve Miller has some customers on offer. Millions of them in fact.

The chief medical officer at Express Scripts, the largest pharmacy benefit manager in the U.S., has been essentially auctioning off his 80 million customers to the drug companies that will give him the best deal.

"Who wants my market share?" Miller says. "Whoever will give me the best price, I will reward you with an enormous amount of market share."