耕作是有生产价值的劳动。
The substance of value is the expense of human productive labor.
价值的实体是劳动，是人类劳动力的生产耗费。
Productive labor theory is irrelevant to national economic accounting theory.
生产劳动理论与国民经济核算理论无关；
Productive labor theory is irrelevant to the theory of the three divisions of industry.
生产劳动理论与三次产业划分理论无关。
Sub-models are effective labor model, fixed capital model, productive cost model and land productivity model.
次一级的模型包括有效劳动模型、固定资本模型、生产费用模型和土地生产潜力模型。
Sub-models are effective labor model, fixed capital model, productive cost model and land productivity model.
次一级的模型包括有效劳动模型、固定资本模型、生产费用模型和土地生产潜力模型。
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