Value of bullion not according to the prime cost at the mines.

42. The value of bullion doth not, like most other things, keep pace with the prime cost, at the mines. If the mines continue working, so that the quantity of bullion is increased beyond the consumption; altho’ the expence to the proprietor of the mine continues the same, or even be increased; yet, if the additional quantity of bullion be thrown as money into circulation, and is not hoarded, or worked up into plate, &c. the value of a given part of this bullion will be diminished; and that in proportion, as it is now a less part of the whole, than it was of the old stock in circulation. The owner of the mine, must either take less profit, or proportion his works more adequately to the consumption of his products.

An increase of any commodity beyond the consumption, will, after the same manner, depreciate the value of a given part; but perhaps in no case so uniformly, as in that of bullion or money.

As the profits from the American mines, have, more than probably, been continually decreasing, ever since the time of their first discovery; it may be wondered, that they have held out so long to yield profit sufficient to tempt the owners to work them. This is to be accounted for, by supposing, what is very natural to suppose, that at first, the profits of these mines, were exorbitantly great: Suppose that the first cargo of bullion, brought from thence into Europe, yielded a profit of 100 to 1: If this cargo was sufficient to double the quantity of bullion before in Europe, the profits of the next would be reduced to one half, or as 50 to 1; and so on, the value of a given part would be decreased, as the sum total was increased.

But as the navigation to the East-Indies, was discovered much about the same time, and a vent was found there for a considerable quantity of bullion; this hath prevented its value from decreasing, in the proportion that the quantity brought into Europe hath increased; and sufficient profits may yet arise from those mines, for a considerable time to come. But, although we should suppose those mines to be inexhaustible; yet, if no new vent be found for their products, they must in time be left to rest; that is, as soon as they cease to yield a profit.