As pointed out by Duesenbeny (1960), "Economics is all about how people make choices. Sociology is all about how they don't have any choice to make." This paper treats Futures Studies as a holistic and synthesized field and follows techniques from Economics and Sociology to bridge "how people make choices" and "they don't have any choice to make." Accordingly, the issue of rationality can be investigated further since choice cannot be made without a well defined rationality concept. The substantive contents of rationality proposed in this paper allow us to further visualize the theory of rational choice, emphasizing both the scientific approach to experimentation and the ethical approach to value judgement.
