"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.