In the traditional economic lot-size models, there exists a common assumption that the holding cost is fixed and inflexible during every order cycle.

传统的经济批量模型通常都假定物品的库存费用是固定不变的。

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Traditional deterministic economic Lot-Size models assume that the demand rate is a constant, that the order cost is inflexible during every order cycle.

传统的确定性经济批量模型通常都假定需求率是常数，且每周期的相关费用是固定不变的。

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