The government enforces a quota on medical positions, enrollments and whatnot in the US, which artificially limits the supply of physicians, thereby increasing their wages. In the past hundred years or so, for instance, while the US population increased by 284%, the number of medical schools declined by 26%, to only 123[3].
Some references, one from the right[1] and one from the left[2].
Again, that is just one (partial) mechanism by which the comment I was responding fails to capture what is really going on in practice. The details aren't important, it was just one example.
Some references, one from the right[1] and one from the left[2].
1.http://www.forbes.com/2009/08/25/american-medical-associatio...
2. http://www.slate.com/blogs/moneybox/2013/11/21/doctors_carte...
3. http://mises.org/daily/1547