本文在给定市场划分条件下，研究了客户转换成本约束下垄断厂商的利润最大化问题，把完全价格歧视和零歧视两种极端情形拓展到一般形式。

This paper analyzes the problem of maximizing the profit of monopoly market under the consumer switching condition which extents it from perfect price discrimination and uniform price to general form.

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首先，在已有文献的基础上，补充研究了垄断厂商二度价格歧视的方法和特点。

Firstly, we studied the method and characteristics of second-degree price discrimination that was enforced by monopoly enterprise on the basis of documents available.

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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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