And all attempts to explain value in terms of these abstract factors must become similarly entangled. The Austrians themselves have pointed out that the explanation of value from the standpoint of individual costs involves a circle, that costs resolve themselves into value-complexes, and that the cost theorists are really explaining value by value.[82] I have shown that the same is true of the Austrian attempt to reduce values to terms of individual utilities. It is also true of Hobson's attempt to combine the two explanations, as shown, and the same could be shown of at least the earlier writings of Professor Marshall.[83] There is another attempt to work out the explanation of value, still in terms of sacrifices in production and satisfactions in consumption, but no longer from the same standpoint, which deserves special attention here. Professor Clark, in the _Yale Review_ for 1892, in the article above referred to, "The Ultimate Standard of Value" (since reproduced as chapter XXIV of the _Distribution of Wealth_), has attempted so to add up individual units of cost and individual units of utility, as to get absolute social units of utility and cost either of which might serve as the ultimate standard of value. It will be remembered that I have already quoted from this article with reference to the quantitative nature of value, and that Professor Clark stands as the leading exponent of the conception that value is a social fact, "is social and subjective," the value put on goods by the social organism. In this article, he is seeking the unit of social value, the measure of the importance of a good to society. Either the unit of social utility or the unit of social detriment would serve, but it happens, he holds, that the unit of detriment is the more available for purposes of measurement, and so the final unit[84] of value is the sacrifice entailed by a quantity of distinctively social labor (p. 261). Professor Clark avoids the complication that labor and capital work together, by isolating labor at the margin, in the manner made familiar in his _Distribution of Wealth_. Assume capital constant, introduce or subtract a small quantity of labor, and whatever of product is added or subtracted is due to that labor only (p. 263). This virtually unaided labor is the only kind that can measure values. Attempts to use the labor standard have come short of success, because of their failure to isolate from capital the labor to which products are due.