This chapter reviews a recent theoretical approach, the causal centrality approach, to the self-concept and to identity-based choice. This approach focuses on people’s beliefs about the cause-effect relationships that exist among features (including identities, but also individual-level characteristics such as memories, moral qualities, personality traits, and so on) of their self-concepts. This approach proposes that an identity is perceived as defining of the self-concept to the extent that it is seen causally central (linked to many other features of the self-concept). Further, this approach predicts that among consumers who share an identity, those who see it as causally central are more likely to engage in behaviors consistent with tha...