Labor is the only source of value.

劳动是价值的唯一源泉。

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Cost is the source of value creation and the driving force of earning profit.

成本是价值创造的源泉，也是产生利润的驱动力。

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Cost is the source of value creation and the driving force of earning profit.

成本是价值创造的源泉，也是产生利润的驱动力。

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