The Washington Post, November 24, 2010

They believe, based on pretty good evidence, that growing concentration among insurers, hospitals, pharmacy benefit managers and drug companies helps explain why health-care costs are rising faster than the cost of everything else.

Insurance companies merge to gain greater clout in negotiating with hospitals and other providers, then the providers merge to gain leverage over the insurers. At any one time, in any one market, one side or the other might have the upper hand, but there is little evidence that the benefits from this endless cycle of consolidation actually flow to those of us who ultimately pay the bills.

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