Group Selection and Methodological Individualism: Compatible and Complementary Douglas Glen Whitman Dept. of Economics California State University, Northridge 18111 Nordhoff Ave. Northridge, CA 91330
[email protected] ABSTRACT: Various authors allege that the theory of group selection is inconsistent with methodological individualism, and therefore analysts must reject at least one of these principles. The present article argues for their compatibility. The meaning of methodological individualism is clarified, and the new version of group selection (articulated by Wilson and Sober (1994, 1998)) is explained. The two principles are then incorporated into a single methodological approach. Group selection affects the assumptions made about the kind of individuals who populate social scientific models, while methodological individualism requires models’ conclusions to follow from the actions and interactions of those individuals. JEL Classification Codes: B40, B52, B53, Z13 Key Words: methodological individualism, group selection, evolution 1 Introduction In his theory of cultural evolution, Friedrich Hayek (1991) explicitly adopts the notion of group selection as an evolutionary force that leads societies to adopt group- beneficial rules and practices. Group selection is a hypothetical process in which traits (whether genetic or cultural) evolve because members of groups that practice them experience greater reproductive success than members of groups that do not. In his earlier work (especially Hayek (1952)), Hayek emphasizes the importance of methodological individualism in the social sciences. Methodological individualism is the practice of explaining social phenomena in terms of the behaviors and interactions of individuals, rather than those of “collective” constructs such as groups, classes, or ideologies. In an influential article, Viktor Vanberg (1986) argues that group selection and methodological individualism are incompatible, a position that has gathered the assent of other social scientists.