Page:Principles of Political Economy Vol 1.djvu/572

550 § 4.Meaning, by the word demand, the quantity demanded, and remembering that this is not a fixed quantity, but in general varies according to the value, let us suppose that the demand at some particular time exceeds the supply, that is, there are persons ready to buy, at the market value, a greater quantity than is offered for sale. Competition takes place on the side of the buyers, and the value rises: but how much? In the ratio (some may suppose) of the deficiency: if the demand exceeds the supply by one-third, the value rises one-third. By no means: for when the value has risen one-third, the demand may still exceed the supply; there may, even at that higher value, be a greater quantity wanted than is to be had; and the competition of buyers may still continue. If the article is a necessary of life, which, rather than resign, people are willing to pay for at any price, a deficiency of one-third may raise the price to double, triple, or quadruple. Or, on the contrary, the competition may cease before the value has risen in even the proportion of the deficiency. A rise, short of one-third, may place the article beyond the means, or beyond the inclinations, of purchasers to the full amount. At what point, then, will the rise be arrested? At the point, whatever it be, which equalizes the demand and the supply: at the price which cuts off the extra third from the demand, or brings forward additional sellers sufficient to supply it. When, in either of these ways, or by a combination of both, the demand becomes equal and no more than equal to the supply, the rise of value will stop.

The converse case is equally simple. Instead of a demand beyond the supply, let us suppose a supply exceeding the