Most institutional theories are good at explaining the persistence of institutions but few are good at explaining change. Too often, we are forced to rely on some sort of external shock-an economic depression, a lost war, a demographic catastrophe-as a deus ex machine to extract us from this dilemma. Alternately, we can rely on gifted and far-sighted actors-entrepreneurs or visionaries-to produce change. Such explanations are unsatisfying, the first because much change occurs in between catastrophes and the latter because the distribution of entrepreneurs and visionaries is itself nonrandom in ways that require explication. Thus, in producing an innovative account of endogenous change applicable to a broad range of events, DellaPosta, Nee and Opper (henceforth DNO) perform a great service. Their model strikes the right balance between detail and elegance, and their case studies demonstrate the breadth of cases to which the theory applies. Having read the article in draft and then, having read it for a second time in its published version, I found myself with few criticisms but many reflections: The article is good to think with. So this essay will be less of a critique and more an elaboration of some thoughts that