because he is able to bring his commodity to market at a lower cost, while its value is determined by a higher. All advantages, in fact, which one competitor has over another, whether natural or acquired, whether personal or the result of social arrangements, bring the commodity, so far, into the Third Class, and assimilate the possessor of the advantage to a receiver of rent. Wages and profits represent the universal elements in production, while rent maybe taken to represent the differential and peculiar: any difference in favour of certain producers, or in favour of production in certain circumstances, being the source of a gain, which, though not called rent unless paid periodically by one person to another, is governed by laws entirely the same with it. The price paid for a differential advantage in producing a commodity, cannot enter into the general cost of production of the commodity.
A commodity may no doubt, in some contingencies, yield a rent even under the most disadvantageous circumstances of its production: but only when it is, for the time, in the condition of those commodities which are absolutely limited in supply, and is therefore selling at a scarcity value; which never is, nor has been, nor can be, a permanent condition of any of the great rent-yielding commodities: unless through their approaching exhaustion, if they are mineral products (coal for example), or through an increase of population, continuing after a further increase of production becomes impossible: a contingency, which the almost inevitable progress of human culture and improvement in the long interval which has first to elapse, forbids us to consider as probable.
