It is not necessary to introduce any extended refutation of this arbitrary, unreal, and fantastic argument. "The theory that labour is the sole source of value has few defenders to-day. In the face of the overwhelming criticism which has been directed against it, even good Marxists are forced to abandon it, or to explain it away."[118] It may, however, be useful to recount very briefly the facts which disprove the theory. Labour creates some things which have no value, as wooden shoes in a community that does not desire wooden shoes; some things have value, exchange value, although no labour has been expended upon them, as land and minerals; the value of things is sometimes greater, sometimes less, proportionately, than the labour embodied in them; for example, paintings by the old masters, and last year's styles of millinery; and, finally, the true determinants of value are utility and scarcity. If it be objected that Marx was aware of these two factors, the reply is that he either restricted them to the function of conditions rather than efficient causes of value, or attributed to them an influence that is inconsistent with his main theory that labour is the sole determinant of value. Indeed, the contradictions into which Marx was led by the theory are its sufficient refutation.[119] With the destruction of the labour theory of value, the Marxian contention that capital contributes only its own original value to the product is likewise overthrown. The same conclusion is reached more directly by recalling the obvious facts of experience that, since the joint action of both capital and labour is required to bring into being every atom of the product, each is in its own order the cause of the whole product, and the proportion of the whole that is specifically due to the casual influence of either is as incapable of determination as the procreative contribution of either parent to their common offspring. The productive process carried on by labour and capital is virtually an organic process, in which the precise amount contributed by either factor is unknown and unknowable. In so far, therefore, as the alleged right of labour to the whole product is based upon the Marxian theory of value, it has not a shadow of validity. _The Right of Productivity_ But the claim is not necessarily dependent upon this foundation. Those Socialists who have abandoned the labour theory of value can argue that the labourer (including the active director of industry) is the only _human_ producer, that the capitalist as such produces nothing, and consequently has no moral claim to any part of the product. Whatever theory of value we may adopt, or whether we adopt any, we cannot annul the fact that interest does not represent labour expended upon the product by the capitalist.