I think we agree. I'm just saying it's not a single fundamental difference between the US system and other systems, it's myriad differences that combine to make things way more expensive in the US.
But you eliminate negotiation as one of those factors using other countries as a reasoning. I've never heard that this is debunked (though I don't expect that it is the sole factor). Do you have sources?
Or did I misunderstand and you are just saying that negotiation (or lack thereof) alone isn't responsible for all the cost headaches?