What emerges in the aggregate may have little to do with what happens at the individual level.  But this aggregate cannot be simply described by some set of aggregate equations.  It emerges out of the soup of the individual and particular with all its multiform interactions and peculiarities.

— J. Barkley Rosser, “Complexity in Economics”

This, I think, encapsulates the methodological individualism of the Austrian School (amongst others). And yes, I’m beginning to familiarize myself as much as I can, given the limits to my command of math (although I’m getting there), with the literature on complexity economics.