_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.