Health care costs across the developed world have skyrocketed for exactly the same structural reasons. Yes, implementations have been different in their details, but the larger structure is the same no matter where you look in the developed world. Government intervention has increased. That means more top-down management and less bottom-up self-organization based on private property and individual incentives.
This is not some spurious speculation. That market-based systems drive down costs enormously is replicated across dozens upon dozens of industries. It's one of the most replicable results in economics to the extent that economics can be replicable. As for why the costs in other countries are not quite as high as the U.S., it's because health care costs also increase as per capita GDP increases and the U.S. has higher per capita GDP. Moreover, because the U.S. has some aspects of its health care system still living more in the private sector, there is less top-down rationing. Other countries see very clear examples of rationing, so people spend less on end-of-life care.
> This is not some spurious speculation. That market-based systems drive down costs enormously is replicated across dozens upon dozens of industries. It's one of the most replicable results in economics to the extent that economics can be replicable. As for why the costs in other countries are not quite as high as the U.S., it's because health care costs also increase as per capita GDP increases and the U.S. has higher per capita GDP. Moreover, because the U.S. has some aspects of its health care system still living more in the private sector, there is less top-down rationing. Other countries see very clear examples of rationing, so people spend less on end-of-life care.
That actually sounds a lot like speculation. You're claiming that the most largest structural difference in the healthcare system in the US compared to other countries is unrelated to the difference in costs, and that other factors explain it, based on inferences from things not related to healthcare. I don't understand how you can have any degree of confidence that single payer versus private insurance has no effect at all based on what you're saying.