Would the State be justified in abolishing rent and interest, and thus enabling labour to obtain the whole product? Conceivably this result might be brought about under the present system of private ownership, or through the substitution of collectivism. Were the change made by the former method land and capital would no longer be sought or have value on account of their annual revenues, but only as receptacles of saving. They would be desired solely as means of accumulating stores of goods which might be exchanged for articles of consumption some time in the future. While we cannot estimate even approximately the decline that would thus occur in the value of land and capital, we may safely assert that it would be considerable. Unless the proprietors received adequate compensation for this loss, they would be compelled to suffer obvious and grave injustice. Any attempt, however, to carry out such a scheme, either with or without compensation, would inevitably fail. Rent might be terminated through the Single Tax, but interest could not be abolished by any mere legal prohibition. Nor does Socialism afford a way out; for, as we have seen in a former chapter, it is an impracticable system. Consequently the theory of the right to the whole product of labour is confronted by the final objection that its realisation would involve greater evils and injustices than those which it seeks to abolish. Finally, the theory is radically incomplete. It professes to describe the requirements of justice as between the landowners and capitalists on the one side, and the wage earners on the other; but it provides no rule for determining distributive justice as between different classes of labour. In none of its forms does it provide any comprehensive rule or principle to ascertain the difference between the products of different labourers, and to decide how the product belonging to any group of men as a whole should be divided among the individual members. Does the locomotive engineer produce more than the section hand, the bookkeeper more than the salesman, the ditch digger more than the teamster? These and countless similar questions are, from the nature of the productive process, unanswerable. Even if it were ethically acceptable, the doctrine of the right to the whole product is hopelessly inadequate.