As the number of company's functions rises, the expense and sale price will be high to make up the cost of company.
公司承担的职能越多，相应发生的费用也越多，产品的销售价格就越高，以期弥补发生的费用。
Between this cost and sale, in other words, between the advertising cost and minimum amount of sale increased in order to make up this cost, there exists a functional relation.
广告成本与产品销售量之间，即弥补广告成本所需增加的最低销售量的增量之间存在函数关系。
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