[hkmurakami]

BadicLly any profession with high levels of credential based regulation and supply constraining that reduces competition.

Dentistry is a great example that forbids even simple procedures to be done by non certified practitioners.

[seanmcdirmid]

Dentistry in other non-USA countries is much less regulated than medicine (which is pretty much socialized). So in Israel, if you want to make money, you become a dentist rather than a doctor.