Thanks for the research. I was replying to Modhatter who seemed to be saying that by far the biggest problem with our health care expenditures was profits/costs of private insurers, and who urged people to get the facts. I was hoping he'd post some facts, but he hasn't so far.
I think dex's number on profit/revenue is meaningful - 3.3%. And MP's numbers on total retention are also good - varying from 13% to 34%.
I went to the government's data source at:
https://www.cms.gov/NationalHealthExpendData/02_NationalHealthAccountsHistorical.asp#TopOfPage Looking at the first zip file, I got "Net Cost of Private Insurance" in 2008 as $92 billion, and premiums at $783 million. That gives about 12%, which is in the ballpark with MP, though it seems a little low.
As MP points out, lots of our expenses are covered by government plans. The oft-quoted 16% of GDP is $2,339 billion. So retention by private insurers (using the $92 billion) is only 3.9% of our total expenditures or 0.6% of GDP. I'm think we've got some other big issues with health care costs besides private insurers.