其结果有三：第一，研究了两寡头厂商实施二度价格歧视时对需求量区间的分段数的合理性问题；

There are three results: 1. We studied the reasonable divisional number of demands while second-degree price discrimination was enforced by two oligarchic enterprises.

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其结果有二：第一，分别研究了垄断厂商二段、三段定价执行二级价格歧视的情形，并给出了需求区间的最优分段点；

The results are as the following: 1. the best division points of demand interval in the case of two stage pricing and three stage pricing are respectively given.

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