That Single Payer would increase healthcare spending by 18T, rather than just moving it around, and increase taxes, while ignoring the part where there's a corresponding decrease in private healthcare spending. The central hook of that WSJ article.

Assuming the 18T figure is correct, how could you just "move it around"?

Putting it simply, the amount that you pay would be moved from a line item on your pay slip called "private health insurance" paid to Aetna or whoever, to a line item called "medicare contribution" or "national health service contribution" paid to the IRS.

On the back end, rather than Aetna shelling out money to the hospital so that you can get treated for free or cheaply, the government would do so - just like it already does for Medicare and VA.

So it is not $18tn additional burden - it is a similar burden, but not going through the hands of private insurers who take a cut.

One thing I haven't seen mentioned: how do you design an organization that manages and efficiently allocates $3-4 trillion in spending across the country? Has it been done before? If so, has such an organization been legislated into existence? Meanwhile, Aetna already insures more people than many countries, so it isn't clear what we'd be getting that we aren't already. I'm curious how single payer will help in the US.

Medicare is actually relatively efficient compared to private insurance companies, and administers a very large amount of healthcare reimbursement.

Insurance is one of the things that a government can be very good at. It's not an area of great innovation, so the benefit of having it be a free market is relatively limited, and negotiation leverage is very important, so size is very beneficial. The natural tendency of the private insurers has been to consolidate and to look more and more like Medicare in terms of size. Except they also have a profit mandate, whereas Medicare doesn't, so they take a percentage of all spending and suck it out of the system. That portion isn't helpful to the users of the system.

I think idea is that the money currently spent by employers and individuals on insurance and direct medical costs would instead be spent on healthcare taxes, and that the current private spending is approximately enough to cover public healthcare if redirected.