亚当·斯密：国富论·第I篇第XI章·第450段

Rent, even where coals afford one, has generally a smaller share in their price than in that of most other parts of the rude produce of land. The rent of an estate above ground, commonly amounts to what is supposed to be a third of the gross produce; and it is generally a rent certain and independent of the occasional variations in the crop. In coal mines, a fifth of the gross produce is a very great rent, a tenth the common rent; and it is seldom a rent certain, but depends upon the occasional variations in the produce. These are so great, that in a country where thirty years purchase is considered as a moderate price for the property of a landed estate, ten years purchase is regarded as a good price for that of a coal mine.

出处： https://www.gutenberg.org/ebooks/3300
定位：Book I, Chapter XI, paragraph 450 · 核对日期：2026-10-19 · 核验：逐字核对

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