Same way you evaluate developers. Say you are a manager at a company who needs to hire somebody to develop an application for you. You aren't technical. You have no idea if you need the thing the consultant is saying you need. So you check completed works, existing client testimonials, educational history, recommendations from coworkers or friends, etc.

Actually that raises an additional interesting point... if the market price is varying from doctor to doctor it could be for many factors - how am I supposed to judge the relative quality of an MRI that would be read by two different specialists. If the quality is different then how can I be informed as to the efficacy and truth of that difference?

With a bank, Bank of America has terrible service - so I just don't use them, with a doctor though... what if I'm paying a premium price but receiving substandard care, given how complex human bodies are most illnesses compound over time and only in very select circumstances could you get a doctor to come in post defacto look at an X-Ray and say "This doctor was terrible, that's totally a tumor" maybe the real issue is that a tingling in your finger tips when you sit down that you asked your doctor about went unnoticed and twelve years later your heart gave out over totally preventable causes.

> Or in any other country, GPs. They decide if you need specialized care. However, how am I supposed to pick one of them? It's Russian nesting doctors.

Same way you would pick anything else? I shopped around for my GP and changed several.

Some factors were: years of experience, user feedback, spoken languages, any red flags for the whole practice, how they respond to my concerns and questions in conversation, etc.