When it comes to the discussions of ancient economic thought, the Stoics rarely come to the forefront. By and large, the lack of focus on this Hellenistic philosophical school is understandable: there is no evidence of the Stoics writing treatises entitled oikonomikos or similar or, in fact, showing any substantial interest in the matters pertaining to wealth management or money acquisition. There is an extant fragment, however, depicting a debate between Diogenes of Babylon and Antipater of Tarsus in which (...) the latter advocates for the moral permissibility of the behaviour that comes very close to exhibiting economic rationality. In this paper, I analyse this passage and, noting its complex transmission history, I argue that it reveals an engagement with various ideas pertaining to the oikonomia genre. Although some of them resemble the contemporary notion of economic rationality, ultimately, the Stoic argument is embedded in ethical debates with the Peripatetics and it concerns moral value rather than the homo economicus style of reasoning about maximizing gains. (shrink)