This paper discusses sociological analyses of the formation and role of expectations in the economy. Recognition of the social constitution of expectations advances the understand- ing of economic action under conditions of uncertainty and helps to explain core features of modern capitalist societies. The range of applications of the analytical perspective is il- lustrated by closer examination of three core spheres of capitalist societies: consumption, investment, and innovation. To provide an idea of core challenges of the approach, three major research questions for the sociological analysis of expectations are presented.