Not, not single payer. I want Aetna, Cigna, Blue Cross , etc to be able to compete for my business. I refer mostly to uncollected monies from co-insurance/co-pays. Imagine a world where there is no shoplifting or employee theft. Could Macy's then offer you lower prices? Absolutely. If Bernie doesn't allow collection of co-insurance amounts, will not even allow credit reporting, then no one will pay voluntarily. Why should they? Ergo to recoup losses just like from shoplifting, medical providers would have to jack up the prices for everyone. It will get a LOT WORSE than the state over the last 50 yrs.
As someone who was once put in charge of hundreds of thousands of dollars in medical receivables, I can tell you, yea, it is. And the money I recovered for them helped them remain staffed, equipped, and supplied. Supplies and equipment come from businesses.