Page:Principles of Political Economy Vol 1.djvu/610



§ 1. have now attained a favourable point for looking back, and taking a simultaneous view of the space which we have traversed since the commencement of the present Book. The following are the principles of the theory of Value, so far as we have yet ascertained them.

I. Value is a relative term. The value of a thing means the quantity of some other thing, or of things in general, which it exchanges for. The values of all things can never, therefore, rise or fall simultaneously. There is no such thing as a general rise or a general fall of values. Every rise of value supposes a fall, and every fall a rise.

II. The temporary or market value of a thing, depends on the demand and supply; rising as the demand rises, and falling as the supply rises. The demand, however, varies with the value, being generally greater when the thing is cheap than when it is dear; and the value always adjusts itself in such a manner, that the demand is equal to the supply.

III. Besides their temporary value, things have also a permanent, or as it may be called, a Natural Value, to which the market value, after every variation, always tends to return; and the oscillations compensate for one another, so that, on the average, commodities exchange at about their natural value.

IV. The natural value of some things is a scarcity value; but most things naturally exchange for one another in the ratio of their cost of production, or at what may be termed their Cost Value.

V. The things which are naturally and permanently at a