Earlier versions of the paper have been presented at the conference "Quels Fondements Epistemologiques pour la Connaissance Economique?" in Mons, Belgium, December 1987 and at the Fifteenth Annual Meeting of the History of Economics Society in Toronto, Canada, June 1988.
Earlier versions of the paper have been presented at the conference "Quels Fondements Epistemologiques pour la Connaissance Economique?" in Mons, Belgium, December 1987 and at the Fifteenth Annual Meeting ot the History of Economics Society in Toronto, Canada, June 1988.