The wants of mankind were said to promote their multiplication, by augmenting the demand for the food of the free hands, who, by supplying those wants, are enabled to offer an equivalent for their food, to the farmers who produced it; and as this way of bartering is a representation of trade in its infancy, it is no wonder that trade, when grown up, should still preserve a resemblance to it.
Demand, considered as a term appropriated to trade, will now be used in place of wants, the term used in the first book relatively to bartering; we must therefore expect, that the operations of the same principle, under different appellations, will constantly appear similar, in every application we can make of it, to different circumstances and combinations.
Whether this term be applied to bartering or to trade, it must constantly appear reciprocal. If I demand a pair of shoes, the shoemaker either demands money, or something else for his own use. To prevent therefore the ambiguity of a term, which, from the sterility of language, is taken in different acceptations, according to the circumstances which are supposed to accompany it, I shall endeavour shortly to analyze it.
1mo. Demand is ever understood to be relative to merchandize. A demand for money, except in bills of exchange, is never called demand. When those who have merchandize upon hand, are desirous of converting them into money, they are said to offer to sale; and if, in order to find a buyer, they lower their price, then, in place of saying the demand for money is high, we say the demand for goods is low.
2do. Suppose a ship to arrive at a port loaded with goods, with an intention to purchase others in return, the operation only becomes double. The ship offers to sale, and the demand of the port is said to be high or low, according to the height of the price offered, not according to the quantity demanded, or number of demanders. When all is sold, then the ship becomes demander; and if his demand be proportionally higher than the former, we say upon the whole, that the demand is for the commodities of the port; that is, the port offers, and the ship demands. This I call reciprocal demand.
3tio. Demand is either simple or compound. Simple, when the demander is but one, compound, when they are more. But this is not so much relative to persons as to interests. Twenty people demanding from the same determined interest form but a simple demand; it becomes compound or high, when different interests produce a competition. It may therefore be said, that when there is no competition among buyers, demand is simple, let the quantity demanded be great or small, let the buyers be few or many. When therefore in the contract of barter the demand upon one side is simple, upon the other compound, that which is compound is constantly called the demand, the other not.
4to. Demand is either great or small: great, when the quantity demanded is great; small, when the quantity demanded is small.
5to. Demand is either high or low: high, when the competition among the buyers is great; low, when the competition among the sellers is great. From these definitions it follows, that the consequence of a great demand, is a great sale; the consequence of a high demand, is a great price. The consequence of a small demand, is a small sale; the consequence of a low demand, is a small price.
6to. The nature of demand is to encourage industry; and when it is regularly made, the effect of it is, that the supply for the most part is found to be in proportion to it, and then the demand is commonly simple. It becomes compound from other circumstances. As when it is irregular, that is, unexpected, or when the usual supply fails; the consequence of which is, that the provision made for the demand, falling short of the just proportion, occasions a competition among the buyers, and raises the current, that is, the ordinary prices. From this it is, that we commonly say, demand raises prices. Prices are high or low according to demand. These expressions are just; because the sterility of language obliges us there to attend to circumstances which are only implied.
Demand is understood to be high or low, relatively to the common rate of it, or to the competition of buyers, to obtain the provision made for it. When demand is relative to the quantity demanded, it must be called great or small, as has been said.