Human needs, although originally derived from biological necessity, are thus a result of the existence of society and are conditioned by the stage of… - Oskar Lange

No scientific law applies when its prerequisite conditions do not occur. Since the administration of scarce resources is influenced by social organisation and institutions, such organisation and institutions are among the conditions implied in economic laws. Consequently, economic laws which hold under one type of social organisation may fail to do so under another type. Most economic laws are thus "limited historically" to certain given types of social organisation and institutions. This, however, does not imply any basic difference between the laws of economics (or of other social sciences) and the laws of the natural sciences. The latter, too, are contingent upon conditions which are subject to change. Different laws of the natural sciences have different degrees of historic permanence, usually a much higher one than the laws of economics, though even this is not always the case (some laws of meteorology are less permanent than some laws of economics). The differences is but one of degree. Like all scientific laws, economic laws are established in order to make successful prediction of the outcome of human actions.

The administration of scarce resources is influenced by the standards of civilisation and by the organisation and institutions of the society in which men live. The influence is a two-fold one. The wants which the resources serve to satisfy are produc of standards of civilisation historically developed in society. The ways in which scarce resources are procured, adapted to various purposes, distributed among different persons are all results of social organisation and social institutions. Forms of ownership, institutions like corporations and banks, technical knowledge acquired in institutes of research and transmitted by schools, regulation by government agencies, habits and moral standards all influence the ways of administering scarce resources.

If people want to anticipate the development of Capitalism over a long period a knowledge of Marx is a much more effective starting point than a knowledge of Wieser, Boehm-Bawerk, Pareto or even Marshall (though the last-named is in this respect much superior). But Marxian economics would be a poor basis for running a central bank or anticipating the effects of a change in the rate of discount.