Early economic theory was rooted in the Italian, French, and Spanish traditions, which were subjectivist oriented. Then it shifted onto the terrible path by Smith and Ricardo and the British classical tradition, which is 'objectivist' - values are in inherent in production.

Positivism eliminates any kind of natural law principle - for example, that there are economic laws which can be transgressed only at your peril. With positivism, there is a tendency to leap into ad hoc economic theory.

Subjectivism is not an absolute principle; it is a necessary but not sufficient condition for sound methodology.

Murray Rothbard Quotes