该模型考虑了商品价值随时间衰减，以及销售价格对销售商利润的影响。

The case study indicates that sale price, compared with goods ordering cycle, has greater impact to the profit.

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然后，从进口价格、进口品的国内销售价格和国内需求等几个方面对模型进行了扩展。

Then, the models will be expanded in several aspects, such as the importing prices, the domestic selling prices and quantity needed of the imports, and so on.

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