This article puts critical realism in conversation with the classical Aristotelian concept of the common good. This concept plays an essential explanatory role in Aristotelian thought, not only a normative one, and so it has something to offer critical realism, which in turn can provide a sound metatheory for common good reflection. It is argued that accounts of emergence based on causal powers and common purpose are compatible and mutually enlightening. Critical realism can develop a distinctive conception of common good (...) based around ontological stratification and social teleology. In this conception, empirical social enquiry is essential for understanding what common goods are available in given social settings, since common goods flow from the intransitive real features of social entities, especially their causal powers. (shrink)