Croce maintains that Marx's theory of value is economic and not moral. Yet it is hard to read Marx and certainly Marxians without finding in them the implication that the values produced in such an economic society would be just. If that implication be examined, we come on an important difficulty still remaining in this theory. The contention that in a system of unfettered economic competition, men get the reward they deserve, assumes that it is just that if one man has a greater power of serving society than another he should be more highly rewarded for his work. This the individualist argument with which we compared Marx's assumes without question. But the Marxian theory of value is frequently interpreted to imply that amount of work is the only claim to reward. For differences in value it is held are created by differences in the amount of labour. But the word amount may here be used in two senses. When men say that the amount of work a man does _should_ determine a man's reward; they commonly mean that if one man works two hours and another one, the first ought to get twice the reward of the second. 'Amount' here means the actual time spent in labour. But in Marx's theory of value amount means something quite different, for an hour of one man's work may, he admits, be equal to two of another man's. He means by amount a sum of abstract labour time units. Marx's scientific theory of value is quite consistent with different abilities getting different rewards, the moral contention that men should get more reward if they work more and for no other reason is not. The equation of work done by men of different abilities by expressing them in abstract labour time units is essential to Marx's theory but fatal to the moral claim sometimes founded upon it. Further the great difficulty in allowing that it is just that men of different abilities should have different rewards, comes from the fact that differences of ability are of the nature of monopolies. In a pure economic society high rewards would be given to rare ability and although it is possible to equate work of rare ability with work of ordinary ability by expressing both as amounts of abstract labour time units, it surely remains true that the value is determined not by the amount of abstract labour time congealed in it but by the law of supply and demand. Where there are differences of ability there is some kind of monopoly, and where there is monopoly, you cannot eliminate the influence of the relation of supply and demand in the determination of value. What you imagine you have eliminated by the elimination of capital, which you can collectivise, remains obstinately in individual differences of ability which cannot be collectivised.