So your earlier comment is entirely irrelevant then, seeing as we're not talking about bread delivery, but delivery of healthcare, where - irrespective of whether we'd agree on the feasibility of efficient delivery of "singlepayer bread" - it has been conclusively proven by example that efficient delivery in a single payer model is possible.

In fact, not only is it possible, but almost every country in the world that has it does it cheaper than the US (depending on currency fluctuations, Norway is ironically one of the less than a handful of countries that is occasionally more expensive than the US - largely driven up by high salaries).