大卫·李嘉图：政治经济学及赋税原理·摘录 281

When a commodity is at a monopoly price, it is at the very highest price at which the consumers are willing to purchase it. Commodities are only at a monopoly price, when by no possible device their quantity can be augmented; and when therefore, the competition is wholly on one side--amongst the buyers. The monopoly price of one period may be much lower or higher than the monopoly price of another, because the competition amongst the purchasers must depend on their wealth, and their tastes and caprices. Those peculiar wines, which are produced in very limited quantity, and those works of art, which from their excellence or rarity, have acquired a fanciful value, will be exchanged for a very different quantity of the produce of ordinary labour, according as the society is rich or poor, as it possesses an abundance or scarcity of such produce, or as it may be in a rude or polished state. The exchangeable value therefore of a commodity which is at a monopoly price, is no where regulated by the cost of production.

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定位：Excerpt 281 · 核对日期：2026-10-19 · 核验：短摘录

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