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In stating the principles which regulate exchangeable value and price, we should carefully distinguish between those variations which belong to the commodity itself, and those which are occasioned by a variation in the medium in which value is estimated, or price expressed.

在说明调节可交换价值和价格的原则时，我们应仔细区分属于商品本身的变化和由于估价或表示价格的媒介的变化而引起的变化。

— David Ricardo 大卫·里卡多