In Germany it works, I'd probably have to study sociology to know exactly why. You said it yourself, German companies tend to be quite efficient, despite or maybe because their workers elect half the board.
I think at this point, Americans would be quite happy to just literally copy and paste any Western European healthcare system, whether for example the UK, Germany or France. That should answer all the questions you have about who is covered, how prices are controlled etc. Healthcare Triage on YouTube has a great series on the healthcare system in many countries
Not all Americans would be happy to copy a European healthcare system, "some" Americans I am sure would be. Some of us Americans want less government than we have now, not more.
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You're right, not all Americans want Medicare For All or a specific European system, and those who don't are very strongly opposed to it. But 70% of Americans are for it, including 52% of Republicans in one poll https://thehill.com/policy/healthcare/403248-poll-seventy-percent-of-americans-support-medicare-for-all
The average of polls is probably around 65% nationally and a plurality of 40-45% of Republicans, but still more Republicans are for it than against
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A single payer system for all medical services is far different from Medicare. I'm all for Medicare, completely support it. But it is a real stretch to compare care for the elderly or those in need to a single payer system for all medical services for the everyone of any age.
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Why is it different? You're literally just giving what you give to elders to everyone. The justification isn't entirely the same, sure, but it certainly works the same way, just guaranteeing healthcare to all people, instead of all people above a certain age
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