How do we compare apples to apples (between countries)? Compare health expenditure per capita (public and private) with multiple health indexes. I.e. get the bang for buck . In the list of nations with the best bang for buck healthcare programs, you will notice that top 20 healthcare programs are mostly single payer. http://www.who.int/healthinfo/paper30.pdf But there are single payer healthcare systems with bad heal…
That's a really important "possible" though. It is a near certainty that if were to transition to single payer healthcare we would not do the transfers to hold everyone profiting from the current system harmless (e.g. health insurance employees). In any realistic scenario there would be winners and losers which is why you see fierce lobbying on both sides of the issue.
It's the difference between Pareto and Kaldor-Hicks (See this prior comment for the definitions: https://news.ycombinator.com/item?id=14605477 )