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increased by restrictive laws, is no burthen on the consumer: it does not raise the price of corn, and is no otherwise a detriment to the public, than inasmuch as if the state had retained it, or imposed an equivalent in the shape of a landtax, it would then have been a fund applicable to general instead of private advantage.

§ 3. Agricultural productions are not the only commodities which have several different costs of production at once, and which, in consequence of that difference, and in proportion to it, afford a rent. Mines are also an instance. Almost all kinds of raw material extracted from the interior of the earth—metals, coals, precious stones, &c., are obtained from mines differing considerably in fertility, that is, yielding very different quantities of the product to the same quantity of labour and capital. This being the case, it is an obvious question, why are not the most fertile mines so worked as to supply the whole market : No such question can arise as to land; it being self-evident, that the most fertile lands could not possibly be made to supply the whole demand of a fullypeopled country; and even of what they do yield, a part is extorted from them by a labour and outlay as great as that required to grow the same amount on worse land. But it is not so with mines; at least, not universally. There are, perhaps, cases in which it is impossible to extract from a particular vein, in a given time, more than a certain quantity of ore, because there is only a limited surface of the vein exposed, on which more than a certain number of labourers cannot be simultaneously employed. But this is not true of all mines. In collieries, for example, some other cause of limitation must be sought for. In some instances the owners limit the quantity raised, in order not too rapidly to exhaust the mine: in others there are said to be combinations of owners, to keep up a monopoly price by limiting the production. Whatever be the causes, it is a fact that mines of different degrees of richness are in operation, and since the value of the produce must be proportional to the cost of production at the worst mine (fertility and situation taken together), it is more than proportional to that of the best. All mines superior in produce to the worst actually worked, will yield, therefore, a rent equal to the excess. They may yield more ; and the worst mine may itself yield a rent. Mines being comparatively few, their qualities do not graduate gently into one another, as the qualities of land do ; and the demand may be such as to keep the value of the produce considerably above the cost of production at the worst mine now worked, without being sufficient to bring into operation a still worse. During the interval, the produce is really at a scarcity value. Fisheries are another example. Fisheries in the open sea are not appropriated, but fisheries in lakes or rivers almost always are so, and likewise oyster-beds or other particular fishing grounds on coasts. We may take salmon fisheries as an example of the whole class. Some rivers are far more productive in salmon than others. None, however, without being exhausted, can supply more than a very limited demand. The demand of a country like England can only be supplied by taking salmon from many different rivers of unequal productiveness, and the value must be sufficient to repay the cost of obtaining the fish from the least productive of these. All others, therefore, will if appropriated afford a rent equal to the value of their superiority. Much higher than this it cannot be, if there are salmon rivers accessible which from distance or inferior productiveness have not yet contributed to supply the market. If there are not, the value, doubtless, may rise to a scarcity rate, and the worst fisheries in use may then yield a considerable rent. Both in the case of mines and of fisheries, the natural order of events is liable to be interrupted by the opening of a new mine, or a new fishery, of superior quality to some of those already in use. The first effect of such an incident is an increase of the supply; which of course lowers the value to call forth an increased demand. This reduced value may be no longer sufficient to remunerate the worst of the existing mines or fisheries, and these may consequently be abandoned. If the superior mines or fisheries, with the addition of the one newly opened, produce as much of the commodity as is required at the lower value corresponding to their lower cost of production, the fall of value will be permanent, and there will be a corresponding fall in the rents of those mines or fisheries which are not abandoned. In this case, when things have permanently adjusted themselves, the result will be, that the scale of qualities which supply the market will have been cut short at the lower end, while a new insertion will have been made in the scale at some point higher up; and the worst mine or fishery in use—the one which regulates the rents of the superior qualities and the value of the commodity— will be a mine or fishery of better quality than that by which they were previously regulated.

Land is used for other purposes than agriculture, especially for residence; and when so used, yields a rent, determined by principles similar to those already laid down. The ground rent of a building, and the rent of a garden or park attached to it, will not be less than the rent which the same land would afford in agriculture: but may be greater than this to an indefinite amount; the surplus being either in consideration of beauty or of convenience, the convenience often consisting in superior facilities for pecuniary gain. Sites of remarkable beauty are generally limited in supply, and therefore, if in great demand, are at a scarcity value. Sites superior only in convenience are governed as to their value by the ordinary principles of rent. The ground rent of a house in a small village is but little higher than the rent of a similar patch of ground in the open fields: but that of a shop in Cheapside will exceed these, by the whole amount at which people estimate the superior facilities of money-making in the more crowded place. The rents of wharfage, dock and harbour room, water power, and many other privileges, may be analysed on similar principles.

§ 4. Cases of extra profit analogous to rent, are more frequent in the transactions of industry than is sometimes supposed. Take the case, for example, of a patent, or exclusive privilege for the use of a process by which cost of production is lessened. If the value of the product continues to be regulated by what it costs to those who are obliged to persist in the old process, the patentee will make an extra profit equal to the advantage which his process possesses over theirs. This extra profit is essentially similar to rent, and sometimes even assumes the form of it; the patentee allowing to other producers the use of his privilege, in consideration of an annual payment. So long as he, and those whom he associates in the privilege, do not produce enough to supply the whole market, so long the original cost of production, being the necessary condition of producing a part, will regulate the value of the whole; and the patentee will be enabled to keep up his rent to a full equivalent for the advantage which his process gives him. In the commencement indeed he will probably forego a part of this advantage for the sake of underselling others: the increased supply which he brings forward will lower the value, and make the trade a bad one for those who do not share in the privilege : many of whom therefore will gradually retire, or restrict their operations, or enter into arrangements with the patentee: as his supply increases theirs will diminish, the value meanwhile continuing slightly depressed But if he stops short in his operations before the market is wholly supplied by the new process, things will again adjust themselves to what was the natural value before the invention was made, and the benefit of the improvement will accrue solely to the patentee.

The extra gains which any producer or dealer obtains through superior talents for business, or superior business arrangements, are very much of a similar kind. If all his competitors had the same advantages, and used them, the benefit would be transferred to their customers, through the diminished value of the article: he only retains it for himself 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 may be 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.

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