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In comparing therefore the value of the same commodity, at different periods of time, the consideration of the comparative skill and intensity of labour, required for that particular commodity, needs scarcely to be attended to, as it operates equally at both periods.

因此，在比较同一商品在不同时期的价值时，几乎不需要考虑该特定商品所需的比较技能和劳动强度，因为这两个时期的工作是平等的。

— David Ricardo 大卫·里卡多