The issue in the US is that there is no price regulation for different procedures (other than Medicare), plus the providers (hospital chains) are intertwined* with insurance. The end result is everyone charges as much as they can and the premiums need to be high, even if insurance technically negotiates the rates down from the “sticker” price. Insurance companies are willing to take a small percent of profit because there is so much money being taken from customers.

* https://www.statnews.com/2024/11/25/unitedhealth-higher-paym...

Right, low profit margins are not a valid argument for why it’s invalid for consumers to suspect there is some inefficiency compared to other markets. Saying the system must be efficient because profits are low is like saying boiling water should be as cheap as 98->99 degrees C because it’s just +1 C - profit margins aren’t as good an indicator of whether there is an unusual amount of disorder in the system, compared to extremely context-sensitive resource costs for hypothetically identical systems.