Many methodologists are firmly convinced that Popper's arguments concerning the status of the rationality principle (RP) are incoherent or incompatible with the essentials of falsificationism. The present essay first shows that the accusation of incompatibility of situational logic with falsificationism does not hold up to scrutiny but then shows that Popper's arguments are nonetheless flimsy if not indefensible. For it seems that one can distinguish between two different versions of the RP in Popper's writings. If the first version is plainly (...) "objectivist" and can be characterized with Popper as empirically false, the second one is rather "subjectivist" and is not falsifiable as such. The essay shows that this second reading of the RP is the one that Popper finally adopts but that, unfortunately enough, this formulation of the RP looks more like a metaphysical statement than like an empirical law. It could then be held to be a priori valid as such, by analogy with Popper's line of argument concerning the principle of causality. If this is correct, then Popper's thesis on the empirical status of the RP is confuted. (shrink)

This French paper is a preliminary version of P. Mongin, "Does Optimization Imply Rationality?", Synthese, 124, 2000, p. 73-111, to which readers are referred to.

The paper revisits the rationality principle from the particular perspective of the unity of social sciences. It has been argued that the principle was the unique law of the social sciences and that accordingly there are no deep differences between them (Popper). It has also been argued that the rationality principle was specific to economics as opposed to the other social sciences, especially sociology (Pareto). The paper rejects these opposite views on the grounds that the rationality principle is strictly metaphysical (...) and does not have the logical force required to deliver interesting deductions. Explanation in the social sciences takes place at a level of specialization that is always higher than that of the principle itself. However, what is peculiar about economics is that it specializes the explanatory rational schemes to a degree unparalleled in history and sociology. As a consequence, there is a backward-and-forward move between specific and general formulations of rationality that takes place in economics and has no analogue in the other social sciences. (shrink)

This article critically discusses the concept of economic rationality, arguing that it is too narrow and specific to encompass the full concept of practical rationality. Economic rationality is identified here with the use of the optimizing model of decision, as well as of expected utility apparatus to deal with uncertainty. To argue that practical rationality is broader than economic rationality, the article claims that practical rationality includes bounded rationality as a particular case, and that bounded rationality cannot be reduced to (...) economic rationality as defined here. (shrink)