The reference contained in practically all definitions of the living wage principle to the standards of a particular time and place assists greatly in interpreting the principle into policy.[118] For this reference is tantamount to saying that the standard of economic life which shall be deemed to satisfy the principle, should be fixed primarily by comparison with the standard of life of the wage earning and middle classes in the community at the given time. This comparison tends to govern the content of the living wage idea. It brings the living wage determination into direct relation with--or makes it relative to--the productive capacity of the industrial system at the time and place in question. For a study of the standard of life of the wage earners and the middle classes of the community is of great assistance in indicating the standard of life to which it may be possible to raise even the worst paid industrial groups, by those adjustments in production and distribution which it is the object of a living wage policy to produce. This essential relativity of the living wage idea is well pointed out in a decision of Justice Brown of the South Australian Industrial Court. "... The statutory definition of the living wage is a wage adequate to meet the normal and reasonable needs of the worker. In other words, the conception is ethical rather than economic. The Court has not to determine the value of the services rendered, but to determine what is necessary to meet normal and relative needs. It should be obvious that in the interpretation of reasonable needs the court cannot be wholly indifferent to the national income. The reasonable needs of the worker in a community where national income is high are greater than the reasonable needs of the worker in a community where the national income is low."[119] The living wage has ordinarily been assessed on different bases for men and women. The basis of assessment for each has been the subject for much controversy. The most generally upheld basis of assessment is, in the case of the male wage earner, to assess his needs on the supposition that he is the supporter of a family consisting of himself, wife, and two or three small children; and in the case of the female wage earner, to assess her needs on the supposition that she is living alone, and is dependent upon her own earnings for her support, and that she has no other obligations. These bases of assessment do not meet all of the demands of logic--applied to the living wage idea--nor, as will be seen, is the choice of different bases of assessment for men and women entirely free of difficulty.[120]