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forth an additional demand equal to itself. This is accomplished by means of cheapness; the value falls, and brings the article within the reach of more numerous customers, or induces those who were already consumers to make increased purchases. The fall of value required to re-establish equality, is different in different cases. The kinds of things in which it is commonly greatest are at the two extremities of the scale; absolute necessaries, or those peculiar luxuries, the taste for which is confined to a small class. In the case of food, as those who have already enough do not require more on account of its cheapness, but rather expend in other things what they save in food, the increased consumption occasioned by cheapness, carries off, as experience shows, only a small part of the extra supply caused by an abundant harvest; * and the fall is practically arrested only when the farmers withdraw their corn, and hold it back in hopes of a higher price; or by the operations of speculators who buy corn when it is cheap, and store it up to be brought out when more urgently wanted. Whether the demand and supply are equalized by an increased demand, the result of cheapness, or by withdrawing a part of the supply, equalized they are in either case. Thus we see that the idea of a ratio, as between demand and supply, is out of place, and has no concern in the matter: the proper mathematical analogy is that of an equation. Demand and supply, the quantity demanded and the quantity supplied, will be made equal. If unequal at any moment, competition equalizes them, and the manner in which this is done is by an adjustment of the value. If the demand increases, the value rises; if the demand diminishes, the value falls: again, if the supply falls off, the value rises; and falls, if the supply is increased. The rise or the fall continues until the demand and supply are again ‘equal to one another: and the value which a commodity will bring in any market, is no other than the value which, in that market, gives a demand just sufficient to carry off the existing or expected supply.

* See Tooke, and the Report of the Agricultural Committee of 1821.

This, then, is the Law of Value, with respect to all commodities not susceptible of being multiplied at pleasure. Such commodities, no doubt, are exceptions. There is another law for that much larger class of things, which admit of indefinite multiplication. But it is not the less necessary to conceive distinctly and grasp firmly the theory of this exceptional case. In the first place, it will be found to be of great assistance in rendering the more common case intelligible. And in the next place, the principle of the exception stretches wider, and embraces more cases, than might at first be supposed.

§ 5. There are but few commodities which are naturally and necessarily limited in supply. But any commodity whatever may be artificially so. Any commodity may be the subject of a monopoly: like tea, in this country, up to 1834; tobacco in France, opium in British India, at present. The price of a monopolized commodity is commonly supposed to be arbitrary; depending on the will of the monopolist, and limited only (as in Mr. De Quincey’s case of the musical box in the wilds of America) by the buyer's extreme estimate of its worth to himself. This is in one sense true, but forms no exception, nevertheless, to the dependence of the value on supply and demand. The monopolist can fix the value as high as he pleases, short of what the consumer either could not or would not pay; but he can only do so by limiting the supply. The Dutch East India Company obtained a monopoly price for the produce of the Spice Islands, but to do so they were obliged, in good seasons, to destroy a portion of the crop. Had they persisted in selling all that they produced, they must have forced a market by reducing the price, so low, perhaps, that they would have received for the larger quantity a less total return than for the smaller: at least they showed that such was their opinion by destroying their surplus. Even on Lake Superior, Mr. De Quincey's huckster could not have sold his box for sixty guineas, if he had possessed two musical boxes and desired to sell them both. Supposing the cost price of each to be six guineas, he would have taken seventy for the two in preference to sixty for one; that is, although his monopoly was the closest possible, he would have sold the boxes at thirty-five guineas each, notwithstanding that sixty was not beyond the buyer's estimate of the article for his purposes. Monopoly value, therefore, does not depend on any peculiar principle, but is a mere variety of the ordinary case of demand and supply. Again, though there are few commodities which are at all times and for ever unsusceptible of increase of supply, any commodity whatever may be temporarily so; and with some commodities this is habitually the case. Agricultural produce, for example, cannot be increased in quantity before the next harvest; the quantity of corn already existing in the world, is all that can be had for sometimes a year to come. During that interval, corn is practically assimilated to things of which the quantity cannot be increased. In the case of most commodities, it requires a certain time to increase their quantity; and if the demand increases, then, until a corresponding supply can be brought forward, that is, until the supply can accommodate itself to the demand, the value will so rise as to accommodate the demand to the supply. There is another case, the exact converse of this. There are some articles of which the supply may be indefinitely increased, but cannot be rapidly diminished. There are things so durable that the quantity in existence is at all times very great in comparison with the annual produce. Gold, and the more durable metals, are things of this sort; and also houses. The supply of such things might be at once diminished by destroying them; but to do this could only be the interest of the possessor if he had a monopoly of the article, and could repay himself for the destruction of a part by the increased value of the remainder. The value, therefore, of such things may continue for a long time so low, either from excess of supply or falling off in the demand, as to put a complete stop to further production: the diminution of supply by wearing out being so slow a process, that a long time is requisite, even under a total suspension of production, to restore the original value. During that interval the value will be regulated solely by supply and demand, and will rise very gradually as the existing stock wears out, until there is again a remunerating value, and production resumes its course. Finally, there are commodities of which, though capable of being increased or diminished to a great, and even an unlimited extent, the value never depends upon anything but demand and supply. This is the case, in particular, with the commodity Labour: of the value of which we have treated copiously in the preceding Book: and there are many cases besides in which we shall find it necessary to call in this principle to solve difficult questions of exchange value. This will be particularly exemplified when we treat of International Values; that is, of the terms of interchange between things produced in different countries, or, to speak more generally, in distant places. But into these questions we cannot enter until we shall have examined the case of commodities which can be increased in quantity indefinitely and at pleasure; and shall have determined by what Law, other than that of Demand and Supply, the permanent or average values of such commodities are regulated. This we shall do in the next chapter.

CHAPTER III.
OF COST OF PRODUCTION, IN ITS RELATION TO VALUE.

§ 1. WHEN the production of a commodity is the effect of labour and expenditure, whether the commodity is susceptible of unlimited multiplication or not, there is a minimum value which is the essential condition of its being permanently produced. The value at any particular time is the result of supply and demand; and is always that which is necessary to create a market for the existing supply. But unless that value is sufficient to repay the Cost of Production, and to afford, besides, the ordinary expectation of profit, the commodity will not continue to be produced. Capitalists will not go on permanently producing at a loss. They will not even go on producing at a profit less than they can live upon. Persons whose capital is already embarked, and cannot be easily extricated, will persevere for a considerable time without profit, and have been known to persevere even at a loss, in hopes of better times. But they will not do so indefinitely, or when there is nothing to indicate that times are likely to improve. No new capital will be invested in an employment, unless there be an expectation not only of some profit, but of a profit as great (regard being had to the degree of eligibility of the employment in other respects) as can be hoped for in any other occupation at that time and place. When such profit is evidently not to be had, if people do not actually withdraw their capital, they at least abstain from replacing it when consumed. The cost of production, together with the ordinary profit,

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