  The contrast between Gilbert and Lewis instantiates a more general debate over Homo economicus: a conception of agents as self-interested and instrumentally rational. Lewis attempts to analyze social phenomena reductively within that framework. In contrast, Gilbert rejects the rational choice conception, opting for a picture, Homo sociologicus, according to which an agent acts based on her self-identification as a member of a social group constituted by various norms. Elizabeth Anderson (2000) analyzes how the clash between these two conceptions relates to convention and normativity.