我們曾在效用理論中發展出若干新觀念，據以修改傳統期望效用理論，並建立恆比避免風險效用函數的修正性模式。本文專門討論新觀念「正常操作點」 與「最低生活所需值」間的關係。這二者密切相關，現有二種方法以求得此二者。從理論出發，可根據假設先確定正常操作點之位置，然後導出最低生活所需值。從實證出發，可先用測驗來求得最低生活所需值，然後導出正常操作點的位置。雖兩種方法之結果並不完全相符，但相去不遠，足以判定此二新觀念之實用性及重要性。 Previously we have developed some new concepts in utility theory, have used them to modify the traditional expected utility theory, and have established some revised forms of constantly- proportional risk-averse utility functions. In this paper, we specifically study the relationship between the "normal operating print" and the "minimum necessity value." These two concepts are closely related. We have two methods to determine the position of the normal operating point and the minimum necessity value. Theoretically, we can determine, based on certain assumptions, the position of the normal operating point first, where from the minimum necessity value first wherefrom the position of the normal operating point can be determined. Although the results of these two methods do not match completely, they car close enough to justify the practicability and importance of these two new concepts.