While the formula of needs must be flatly rejected as complete rule of distributive justice, or of wage justice, it is valid and indispensable as a partial standard. It is a partial measure of justice in two senses: first, inasmuch as it is consistent with the admission and operation of other principles, such as productivity and sacrifice; second, inasmuch as it can be restricted to certain fundamental requisites of life, instead of being applied to all possible human needs. It can be made to safeguard the minimum demands of reasonable life, and therefore to function as a minimum standard of wage justice. Human needs constitute the primary title or claim to material goods. None of the other recognised titles, such as productivity, effort, sacrifice, purchase, gift, inheritance, or first occupancy, is a fundamental reason or justification of either rewards or possessions. They all assume the existence of needs as a prerequisite to their validity. If men did not need goods they could not reasonably lay claim to them by any of the specific titles just enumerated. First comes the general claim or fact of needs; then the particular title or method by which the needs may be conveniently supplied. While these statements may seem elementary and platitudinous, their practical value will be quite evident when we come to consider the conflicting claims that sometimes arise out of the clash between needs and some of the other titles. We shall see that needs are not merely a physical reason or impulse toward acquisition and possession, but a moral title which rationalises the claim to a certain amount of goods.[243] _Three Fundamental Principles_