ABSTRACT
The existence of factors exerting an off setting impact which have to accompany every dynamic law affects not only the specific the oretical formulation of any dynamic law, but also the complexity involved in its em pirical identification. As a result of the existence of a large number of factors that greatly strengthen (or weaken) its impact during a given period, a dynamic law may be iden tified only through patient investigation and even in this case only if we intend to find its basic trends and not its precisely en suing consequences. In addition, if we want to iden tify empirically the functioning of a dynamic law, we must also bear in mind all the other dynamic laws,
because they are all interrelated and interdepen dent, constituting — in their entirety — a certain system of laws.