Abstract

It is frequently repeated that the rationality principle is the fundamental principle of economics and it is so much so that the same principle is equivalently designated as the «economic principle»1. However, it is often the doom of fundamental principles that they are so intimately associated with the science itself that those who practice this science rarely take notice of their presence and of their role. Consequently, it is not surprising not to find any entry for "rationality" or for "rationality principle" in virtually any treaties on economy. If rational behaviour is the object of economics like living organism is the object of biology, specific references could hardly be expected in either of these sciences to what is nothing but the affirmation of the very existence of their subject matter.