Well I will doubt the supply side. I think it's a simpler assertion, because I know so few nerds.
I grew up in the mid-south and know of literally one or two other people that code.
I know live in a major metro area and still only know maybe 3 people that code. It is actually a rare skill.
At the same time, I can't even count how many contractors, real estate agents, sales and marketing, and doctors and lawyers that I know.