http://en.wikipedia.org/wiki/Homo_economicus "[Political economy] does not treat the whole of man’s nature as modified by the social state, nor of the whole conduct of man in society. It is concerned with him solely as a being who desires to possess wealth, and who is capable of judging the comparative efficacy of means for obtaining that end." -- In my opinion, moralities derive from man's nature modified by the social state. So you can see, those people who live in social groups tend to cooperate to achieve mutual interests. But if you insist on the concept of Homo Economicus which says rational man should only pursue his own goal irrespective others' interest, then you would feel altruistic conduct is npt rational. http://www.archive.org/details/worksofadamsmith01smituoft http://socserv.mcmaster.ca/econ/ugcm/3ll3/ingram/contents.html http://www.archive.org/search.php?query=John%20Kells%20Ingram -- --

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