http://blogs.wsj.com/washwire/2015/04/16/public-vs-private-health-insurance-on-controlling-spending/

No single fact can settle the long-running debate of whether public or private health insurance is preferable. But by one basic metric, the rate of increase in per capita spending, public insurance has an edge.

http://www.healthcaredive.com/news/public-option-back-on-the-block-what-it-means-for-private-payers/425522/