Here is how Callon defines homo economicus 2.0 in terms of Barry’s notion of the “interactive diagram:”
The interactive diagram is a socio-technical agencement configured in such a way that at the center of the collective action we find an individual who is capable of developing projects and is endowed with a will to accomplish them, and who holds herself (because she is held) responsible for her acts and their effects. This diagram constitutes a particular answer to questions concerning the modalities of action. To the question “Who is at the source of the action?” the diagram answers “The individual and her projects.” To the question “What is the status of the different participants in the action?” it answers “On the one hand the individual defining and undertaking projects, whose identity changes and adjusts in relation to feedback and results, and on the other hand the technical devices with which she interacts and which constantly suggest original courses of action.” To the question “What does the action produce?” it answers “The discovery of possible new worlds, the unexpected, constant experimentation.” (p. 39)
