The linear demand curve has reflected the relation between some commodity demand volume and price of specific period.
线性需求曲线反映了特定时期某商品需求量与价格之间的关系。
The retailer's commodity demand volume is influenced by competitor's advertising input as well as by one's own advertising inputting.
零售商的商品需求量除了受到自己的广告投入影响还受到竞争者广告投入的影响。
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