... small money-making opportunities, they could be easily explained away by a variety of arguments, the most pervasive of which was the failure to adjust properly for risk. It may be precisely because rationality is such a fundamental concept, in different areas, that it has in the past tended not to be closely examined: rationality is the main feature that has distinguished human beings from other animals; and irrationality is the main reason for which people have been dispatched to mental hospitals. It has been only recently that philosophers and economists have started to examine what mean by it: although the concept does get mentioned in various, mostly very technical contexts. As a first approach, what is the meaning of investor rationality is a investor buying or investing shares logically for good reasons. Reasons for investing or buying shares are ''good,'' if we have taken into account the available facts and ...

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