Before taking up the question of the morality of profits, it will be helpful, if not necessary, to consider the chief rules of justice that have been or might be adopted in distributing the product of industry among those who participate actively in the productive process. While the discussion is undertaken with particular reference to the rewards of the business man, it will also have an important bearing on the compensation of the wage earner. The morality of rent and interest depends upon other principles than those governing the remuneration of human activity; and it has been sufficiently treated in chapters xii and xiii. The canons of distribution applicable to our present study are mainly six in number: arithmetical equality; proportional needs; efforts and sacrifices; comparative productivity; relative scarcity; and human welfare. _The Canon of Equality_ According to the rule of arithmetical equality, all persons who contribute to the product should receive the same amount of remuneration. With the exception of Bernard Shaw, no important writer defends this rule to-day. It is unjust because it would treat unequals equally. Although men are equal as moral entities, as human persons, they are unequal in desires, capacities, and powers. An income that would fully satisfy the needs of one man would meet only 75 per cent., or 50 per cent., of the capacities of another. To allot them equal amounts of income would be to treat them unequally with regard to the requisites of life and self development. To treat them unequally in these matters would be to treat them unequally as regards the real and only purpose of property rights. That purpose is welfare. Hence the equal moral claims of men which admittedly arise out of their moral equality must be construed as claims to equal degrees of welfare, not to equal amounts of external goods. To put the matter in another way, external goods are not welfare; they are only means to welfare; consequently their importance must be determined by their bearing upon the welfare of the individual. From every point of view, therefore, it is evident that justice in industrial distribution must be measured with reference to welfare rather than with reference to incomes, and that any scheme of distribution which provided equal incomes for all persons would be radically unjust. Moreover, the rule of equal incomes is socially impracticable. It would deter the great majority of the more efficient from putting forth their best efforts and turning out their maximum product. As a consequence, the total volume of product would be so diminished as to render the share of the great majority of persons smaller than it would have been under a rational plan of unequal distribution. _The Canon of Needs_