If we had 5x as many doctors our medical costs would probably be about 4x lower.
Unfortunately this is not the case — the problem with health care costs are not the lack of competition driving up the cost of medicine, it is the regulatory burden. In. system where 18 cents on the dollar translate to patient care (and that includes professional component such was physician fees) the issue is not tubers of physicians. Tort reform would be the thing that puts the biggest dent into medical costs. Passing meaningful tort reform with loser pays and caps on awards would probably drive down the cost of medicine 60% overnight.