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.
