Assuming... that all available goods of higher order are employed in the most economic fashion, the value of a concrete quantity of a good of higher … - Carl Menger

The solution of the most important problems of the theoretical social sciences in general and of theoretical economics in particular is thus, closely connected with the question of theoretically understanding the origin and change of 'organically' created social structures.

Not only in the realm of the ethical world, and of economy, but also in that of natural phenomena, the realistic orientation of theoretical research can lead only to "real types" and "empirical laws." And in the above point of view, at any rate, no essential difference between the ethical and the natural sciences exists, but at most only one of degree. The realistic orientation of theoretical research excludes in principle, rather, in all realms of the world of phenomena the possibility of arriving at strict (exact) theoretical knowledge.

The time period lying between command of goods of a higher order and possession of the corresponding goods of lower order can never be eliminated.