you to buy now or to forfeit for ever. Here, as before, only one element is operative; before it was D, now it is U. But after all, D was not absent, though inoperative. The inertness of D allowed U to put forth its total effect. The practical compression of D being withdrawn, U springs up like water in a pump when released from the pressure of air. Yet still that D was present to your thoughts, though the price was otherwise regulated, is evident; both because U and D must coexist in order to found any case of exchange value whatever, and because undeniably you take into very particular consideration this D, the extreme difficulty of attainment (which here is the greatest possible, viz. an impossibility) before you consent to have the price racked up to U. The special D has vanished; but it is replaced in your thoughts by an unlimited D. Undoubtedly you have submitted to U in extremity as the regulating force of the price; but it was under a sense of D's latent presence. Yet D is so far from exerting any positive force, that the retirement of D from all agency whatever on the price this it is which creates as it were a perfect vacuum, and through that vacuum U rushes up to its highest and ultimate gradation."
This case, in which the value is wholly regulated by the necessities or desires of the purchaser, is the case of strict and absolute monopoly; in which, the article desired being only obtainable from one person, he can exact any equivalent, short of the point at which no purchaser could be found. But it is not a necessary consequence, even of complete monopoly, that the value should be forced up to this ultimate limit; as will be seen when we have considered the law of value in so far as depending on the other element, difficulty of attainment.
§ 2.The difficulty of attainment which determines value, is not always the same kind of difficulty. It sometimes consists in an absolute limitation of the supply. There
