In the second place, Böhm-Bawerk’s theory of price is misleading, since it obscures the fact that the Austrian theory of value always assumes the supply of the goods whose value it is to explain. The Austrian writers themselves teach us that the value of a good depends upon the supply of it. The theory of marginal utility explains very well why an increase of supply lowers value or a decrease raises value. But if there should be any cause which limits or regulates the supply of goods with reference to their value, _by some kind of an adjustment to value_, this cause would be both a cause and a regulator (or at least a part regulator) of value. Cost of production in some ultimate form is by many writers supposed to be such a cause. The human “pain cost” of producing goods is of equal importance in theory with the human pleasure gain had from utilizing the goods. The value of an addition to the stock of a given sort of goods always furnishes a motive for the increase of the stock. Any cause which limits the supply at a certain point in the face of this human desire for the increase is a cause of value. True, it is a cause more remote than utility, but still a cause of value. Since the Austrian writers virtually ignore the cause or causes governing supply (and thus governing or helping to govern marginal utility itself), the doctrine of price which they advance ought to rest openly and squarely upon the assumption that the supply of the good is taken for granted. In Böhm-Bawerk’s theory of price, the total supply of horses in the miniature market is simply assumed, not accounted for.[220] If horses were more plentiful in this market the sellers’ price equivalent would be lowered and the market price would turn out lower. It is a fair criticism that Böhm-Bawerk obscures the important point of the dependence of price upon supply, by assigning sellers and buyers an arbitrary series of money valuations as the very first step in his argument. The “theory of price,” as the Austrians call that part of their theory which traces the connection between consumers’ “subjective” values and market exchange values, must begin with a clear recognition that the pure utility theory of value assumes outright the extent of the supplies of all goods. Let us, then, inquire first how the price of a given supply of consumption goods is determined.[221] If a certain supply of some consumption good is presented for sale in the social market, there is theoretically some one price at which just this amount of goods can be sold. Following Professor Marshall, we may call this the “social demand price.” At a higher price, only a less supply could be disposed of. At a lower price more could be sold. The competition of buyers ultimately prevents this lower price being set. The dependence of the social demand price of a given supply of goods upon the esteem value of these goods to the consumers in the social market may be traced as follows: