What are you talking about. Health is the definition of inelastic demand. Then add the almost missing negotiating powers of a single consumer vs an insurance giant and you have a very efficient system for those on the supply side of the equation and a death sentence for a lot of people on the demand side. The American system is efficient only for health insurance companies and no one else.

>> a single consumer vs __an insurance giant__

Exactly. And that's a result of regulations.

Then how is it possible for the rest of the developed countries with heavier government role in healthcare to provide better care that costs less?

Many will say that "better care" is up to opinion and debate.