Principles of Political Economy

by Arthur Latham Perry

"Demand" is a technical term in Economics, and accordingly needs to be defined, and then always used in its defined sense. So is "Supply." Demand is the "desire" of a "person" for something in the hands of another person, coupled with the possession of something else capable of buying that something. Mere desire has no function in Political Economy: hungry and penniless children passing by the stalls of a great market, have no influence on the prices or values of the viands, on which they cast their eager glances: only desires accompanied by "efforts" competent to excite the desires and to pay for the efforts of another are a Demand. Supply is the same thing as Demand looked at from the other side. Supply is the correlative of Demand. The Supplyer is a person, who has in his possession something desired by the Demander, and who in turn desires something in the hands of the Demander, when both are willing to exchange their "renderings." There is no economical difference in the position of the Demander and the Supplyer. Each is equally a Demand and a Supply with reference to the other. It is the old and ever-recurring case of Value, the propositions being here stated in their most universal terms.

For simplicity's sake, however, and for convenience, without altering the substance of the definitions a particle, the valuables when looked at as a Demand are practically reduced in all markets to their equivalent in Money, so that Money offered or ready to be offered against any other exchangeable thing constitutes what is called in commercial language a Demand; and this is sufficiently accurate as well as current, although it must always be remembered that each valuable in any market in reality constitutes a Demand for another, and is equally a Supply in reference to that other. Supply is any exchangeable thing offered for sale against any other exchangeable thing. For example, corn in any market is at bottom a Demand and a Supply at once for every valuable offered in that market at that time, say, ploughs for one thing; but in the talk of the market, the presence of corn there, or its being ready to be immediately brought there and offered in exchange for money, constitutes what is called a Supply of corn; money offered, or ready to be offered, in exchange for corn, constitutes what is called a Demand.

On this account Money seems to play a much more important part in trade than it actually does play; the corn is sold in the terms of money, that is, for dollars and cents as denominations of Value; convenience dictates such a reduction of general Value to this particular form of it, because this is found to make easier the ultimate exchange; but there is not one chance in a hundred, as trade runs nowadays in the larger markets, that this seller of corn will take his pay for it in actual money whether metallic or paper; money is never an ultimate product, but only an intermediate one; this seller of corn wants perhaps a plough or some other farming implement, and ten to one he will take for his corn a bill or order in some form on the seller of ploughs, and it will be corn for a plough, each becoming a Demand and a Supply for the other, though money or rather its denominations has acted as an agent in bringing about the final trade; the details of all this in manner and result will be as plain as day when we come to study "Money" and "Credits" in following chapters; while the essential point to be noted here is, that all Valuables are a Demand and Supply as towards one another. In other words, the world over, A market for products is products in market.

What, then, is Market-Value returned in the terms of Money? And what is the universal Law of it?

Market-value is the present rate of exchange between dollars and cents and any other valuable, that can be fairly graded in a class made up of valuables similar to itself; and the law of market-value is the equation of Supply and Demand, that is, the current rate is adjusted when money enough is offered to take off within the usual times the valuables on hand and offered for sale. If Demand for any reason become quickened, and the Supply be not increased, there is competition among buyers for the stock in market, and the market-rate rises or tends to rise. If, on the other hand, Demand become sluggish, the Supply remaining the same, there is a like competition among the sellers to dispose of their stock, and market-value sinks or tends to sink. So far it is the simple action on Value of the element of one "desire" expressing itself through a money-demand, the elements of "desire" and of "efforts" expressing themselves through Supply being supposed to remain stable, and the pulsations in the market-rate follow accordingly.

How far can this simple action go? Demand increasing, Supply remaining as before, market-rate rises: how far can it rise from this cause? Here we must remember that Demand not only acts upon Value, but also Value reacts upon Demand. As Value rises, the number of those whose means or inclinations enable them to purchase at the new rate is constantly diminished: there are ten persons who may wish an article at one dollar, of whom not over four will wish it at two dollars, and perhaps only one at three dollars. Every rise in market-rate then, under the impulse of enlarged Demand, tends to cut off a part of that Demand, that is, to lessen the number of those who will purchase at the increased price; and the rate consequently can only rise to that point, whatever it be, where an equalization takes place between the Supply and Demand, between the quantity of flour, for example, offered at the enhanced rate, and the quantity of money in the hands of those willing to exchange it for flour at the higher rate.

Just so in the reverse way, when Demand is slackened, Supply continuing as before, the market-rate is sure to decline; but declining rates tend strongly in turn to increase the demand by bringing the article within the range of a larger number of purchasers; Society is like a pyramid, each lower stratum is broader than the one above; and so the decline of rates under a weaker Demand is arrested by a stronger Demand coming from a wider circle of buyers, and a new market-rate is determined at the point of equalization between the new Demand and the old Supply. Thus every rise or fall of Demand tends to check itself, and will check itself in all the great classes of valuables, even without any variations in the Supply; everything oscillates under the variations of Demand; while the point of stable equilibrium, if we may use the expression of anything so unstable as Market-value, is always the equation of Supply and Demand.

But all considerable variations of market-rate are commonly checked at an earlier point than the one just indicated by variations in the Supply. A sharper Demand carries up the market-rate, and a higher market-rate commonly acts upon Supply to enlarge it, and an increased Supply too checks the rise of market-rate. Per contra, a slacker Demand lowers market-rates, and lowered rates often lessen the Supply by the action of holders and speculators,—holders withdrawing their stock for a better market, and speculators buying now when the article is cheap to store away until it shall be dearer. Thus rise of market-rate from Demand growing stronger is checked doubly; first, by curtailing the number of would-be buyers, and second, by enlarging the Supply: the fall of market-rate from Demand growing weaker is checked doubly; first, by increasing the number of consumers of a now cheaper article, and second, by a diminution of Supply by the action of holders and speculators. This double and harmonious working of the law of the Equalization of Demand and Supply is one of the most comprehensive and beautiful laws in Political Economy.

Besides this, we must note the effect on Value of conditions in Supply only, Demand being supposed to continue steady. There are three classes of valuables in respect to the law of their Supply. (1) When the Supply is scant, and cannot be increased at all, as is the case with choice antiques and certain gems and paintings by the old masters, their value may rise to any point under the action of Demand, there is and can be in such cases no market-rate, and the individual value will be struck at the point of equalization of the demand then existing with the supply there offered. For instance, the French Government paid, in 1852, 615,300 francs for a painting by Murillo, which had belonged to Marshal Soult. The genuine Murillos are comparatively few, and their number cannot be increased, and their merit causes a strong "desire" to possess them, and their value rises in connection with the limitation of Supply to a point beyond which no one purchaser can be found. When this painting was offered in Paris for sale, many "persons" of course were anxious to buy it, there was but one painting, there could be but one purchaser, value rose under the influence of a sharp Demand, the rise could not be checked by any duplication of the Supply, and the equation was complete and the value for that sale determined when one party distanced all other competitors and offered a sum greater than any one else would give. The same principle controls all sales of this sort, and is practically the principle of the Auction, whose very name indicates its nature in this regard, that Demand becomes restricted to one party, and that the highest bidder.

(2) When the Supply, instead of being absolutely limited, can only be increased with difficulty or after the lapse of time, similar but less extreme results will be observed. Let us suppose, that pianos are selling in some rural community at $300 each, that there are twenty persons in the place who want a piano immediately, that there are but fifteen pianos on hand, and that the number cannot be increased for half a year. The market-rate will certainly rise above $300. How much above? To that point, at which only fifteen of the twenty will be willing to purchase at the new rate. The equation of Supply and Demand will be reached by a rising rate which cuts off five competitors. This is the principle, working only roughly in practice through the estimates and good judgment of dealers and purchasers. A better illustration of this second class of cases is, perhaps, the Grains and other agricultural products. When these have been gathered, there is no more home supply for a year; and any deficiency in the crops will raise their market-rate, not at all in the ratio of the deficiency, but according to the relations of the diminished Supply to a new Demand. Since the abolition of the Corn-Laws in England in 1846, and the resulting ease of grain-imports from abroad, a deficiency of home crops has no such effect on the price of cereals as it had before that time; when, according to Tooke's History of Prices, an expected falling-off of one third in the crops often doubled and sometimes quadrupled the usual prices; which shows that the world ought to become one country in respect to all food supplies, as indeed happily it is now for the most part, each country allowing them to be distributed freely everywhere in accordance with this law of Demand and Supply. Speculation is more busy in grain, in cotton, and in such things generally, because a new Supply can only be had once a year; early information is eagerly sought at the trade centres in regard to the prospects of the growing crops, and has its influence one way or the other on current prices; but the world is so wide and all the parts of it now so closely connected together by steamship and telegraph, that the prices of the great food staples are remarkably uniform over the earth, and Speculation has not the chance it once had to count and "corner."