Originally Posted by Koyote

I stopped reading right there. I can tell you, as a person with a PhD in economics and 35 years of experience in the profession – which includes a tenured full professorship – that statement is completely wrong.

Edited to add: I read a bit more because I’m on my trainer and bored. If one of my students ever referred to a “supply demand curve,“ I would ask him to make up his mind: there’s a supply curve, and there’s a demand curve, but there is no “supply demand“ curve.