Translator's introduction: To understand the significance of this paper, the American reader should recall that, as Talcott Parsons says, German “idealistic empiricism” led to a repudiation of analytical social and economic theory “in favor of the concrete uniqueness and individuality of all things human.” The “general analytical level of scientific comprehension [was] a priori excluded” from the field of human action. Understanding of things human “in terms of the concrete individuality of the specific historical case became the goal.” Professor Arthur Spiethoff, once a student, later an assistant, of Gustav von Schmoller, and a friend of Edwin F. Gay while the latter studied in Berlin, moved away from that point of view. He recognized analytical theory as a legitimate subject and thereby deviated from what can be considered the typical nineteenth-century German attitude.