David Ricardo：On the Principles of Political Economy and Taxation, Excerpt 69

Like every other commodity, the value of the metals is subject to variation. Improvements may be made in the implements and machinery used in mining, which may considerably abridge labour; new and more productive mines may be discovered, in which, with the same labour, more metal may be obtained; or the facilities of bringing it to market may be increased. In either of these cases the metals would fall in value, and would therefore exchange for a less quantity of other things. On the other hand, from the increasing difficulty of obtaining the metal, occasioned by the greater depth at which the mine must be worked, and the accumulation of water, or any other contingency, its value, compared with that of other things, might be considerably increased.

Source： https://www.gutenberg.org/ebooks/33310
Locator：Excerpt 69 · Verified：2026-10-19 · Verification：Short excerpt

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