Earlier quoted context omitted.
This seems like an argument that can be used to argue that shortages cannot exist for anything you can buy. The same rough argument could be used to argue that food shortages cannot exist. I'm pretty sure the word shortage already implies that there is a shortage at the market price, not at an arbitrary price.
I see your point, and thinking about it helped clarify my thinking, so first, thank you for that. I think another way of phrasing my opinion is that the US labor market is a large, reasonably efficient market; that it's reasonably well modeled by a simple supply and demand model; and that discussing it in other terms obscures the important issues. The notion of a shortage is fundamentally incompatible with a simple s…
Constraining supply increases salaries precisely because it takes supply so long to incorporate information.
On top of that, supply and demand is a pretty leaky abstraction, I don't expect it to be very accurate in such a nonideal market.