In single payer systems, that’s determined by a body whose responsibility is to provide the most effective healthcare to all its citizens given a limited budget.
In the US, the monetary value of extending your life is proportional to the amount of money you spend on your health insurance (and appropriate actuarial tables).
Both systems have flaws.
In other countries, it’s often the health service itself that is paying.
Don’t get me wrong, I believe the single payer system is infinitely better, but for a small number of people, it will lead to worse healthcare outcomes.
A great book comparing eight national systems in The Healing of America by T.R. Reid. It references stats showing the French-style systems get the highest quality results, with reasonable cost. Japan and Germany have similar systems.
But it's not like there is some kind of upper limit on coverage. If you have cancer, you will get treatment regardless of how much your care has already cost.
Every single one of those criteria is subjective, which is why you see these fundraising campaigns for kids with cancer to go and a get a multimillion dollar treatment in the US, because as a parent, accepting that there’s more you COULD do if you just don’t give up is hard.
https://www.cbc.ca/news/health/cancer-costs-report-1.7404064
"During more than two years of treatment, which included surgery to remove part of the colon as well as 12 rounds of chemotherapy, Percoco paid more than $4,000 out of pocket for prescription drugs, including medications to cope with the side-effects and complications. On top of that, there were costs for colostomy bags, which she had to restock every four days, bandages, physiotherapy sessions and osteopathic consultations, as well as travel and parking."
The underlying cause is that there is an almost infinite demand for medical costs - well beyond the economic capacity of any country.
Unfortunately facts are difficult, and politicians can't fix the facts regardless of how much they tax everybody.
If we broke healthcare spending down by person a small percentage of the population is probably consuming a huge percentage of healthcare. The average person just goes to the doctor once or twice a year and has a few large surgeries during their lifetime.
I would be ok with that if there was some kind of guarantee for those of us who didn't abuse the system and did our best to manage our own health. If I haven't gone to the doctor for 2 years and I need to wait 3 months to get an appointment that doesn't feel right.
Live healthy, live long, die fast.
Live unhealthy, live short, die slow.
Throw in accidents and unexpected life events and boom, you can transistion from health to unhealthy quickly.
But our public health system has to use a variety of techniques to limit the total healthcare expenses - such as waiting lists. Drug budgets are restricted which means that many expensive anti-cancer drugs are not available to the public.
Would you be happy to pay 100% of your income in taxes? That is the logical outcome of ever-increasing healthcare and nursing costs. Some wealth tax suggestions here in NZ approach 100% taxation over a lifetime (2% of wealth per year certainly crimps a 4% drawdown on retirement savings).