There are many examples of for-profit systems that don’t have this problem, it’s really the heavily regulated for-profit systems that have this “cost disease” issue. It seems to happen whenever there isn’t a transparent market, like the tuition price of a university, the cost of your surgery, or the cost the government will pay for some infrastructure. The buyer doesn’t know what they’ll pay or what product they’ll get for it, so it’s basically not a free market at its most fundamental level.