Abstract: Re-study of preposition about “F-distortion” shows that the presumption of Friedmann theory is established on the realistic base, but the presumption emphasizes more the influence of the critical element occurring in the subject. At the same time, Friedman believes that excessively emphasizing reality is harmful to exposing essence rules. In the process of obtaining assumed intensive accuracy, the problem that whether the cost can make up profit should be considered. Once the cost fails to make up the profits, a relatively simple presumption can be adopted. Thus, Samuelson has deflectively understood relationship between the fabulosity of Friedmann assumption and its theoretical effectiveness, thus no “F-distortion” exists.

Key words: presumption, theory, F-distortion