"Sociology did have a period of core theory consolidation, in the person of Talcott Parsons, whose contributions in the three decades starting in 1937 were systematically geared towards synthesizing the greats of traditional sociology (Max Weber, Emile Durkheim, and Vilfredo Pareto), as well as indicating precisely how the sister disciplines of psychology, economics, and political science might articulate with core sociological theory. There is no doubt but that Parsons' body of theory is seriously flawed, but there was much more than enough to build on in forging a core sociological theory. Parsons correctly started with the division of social life into roles occupied by actors who internalize the norms and values associated with these roles. However, he made the mistake of identifying the rational actor model of economic theory with Homo economicus, the socially isolated selfish material maximizer. It is true that this is how the rational actor model was depicted in economic theory, but only by happenstance, not intrinsic logicality. Extending the rational actor model to include moral elements as well as material elements, self-regard as well as other-regard, would have given Parsons exactly the tool he needed to create a core sociological theory. However, he did not take this step, probably because (a) Pareto had convinced him that the economics/sociology split was just the norms and values/material self-interest split, and (b) he was a poor mathematician can couldn't handle the sophistication of the rational actor model. So he moved on to structural-functionalism, which is useful and insightful, but quite incapable of supporting an analytically cogent sociology."