Equilibrium vs. disequilibrium?

Adolfo Laurenti writes on Facebook:

Reminiscences from Tyler Cowen‘s macroeconomics class: “there are three ways to think about market equilibrium: (i) markets are always in equilibrium, (ii) markets are sometimes in equilibrium, and (iii) markets are never in equilibrium. And (i) and (iii) are much closer and alike than (i) and (ii) or (iii) and (ii).” Is this Tyler’s oral tradition only? I do not know if he put this down in writing anywhere. Anyone with a reference?

I meant that as a Quinean point of course.