Beyond the Notion of Rationality, Economics as a Moral Science

The centrality of the notion of rationality in economic science makes it a privileged key access to it. This situation explains that it is the stake of an important part of the efforts to the reconstruction of economic science. Attempting to enrich the notion of instrumental rationality by the one of cognitive rationality, the so-called "cognitive turn", is one of the most remarkable in the developments of contemporary theory. This article shows that those developments must be understood at the starting point of epistemic walrassian choices, without managing to go beyond them. Therefore, it is necessary to go beyond and to rely on hermeneutic conception of economics as a moral science, in the wake of Menger and Weber.