与以收支平衡为条件的平均成本价相比，二部定价实现了帕累托改进，提高了社会福利。但是二部定价对社会福利的增加也应该满足一定的条件。
Compared with the average cost pricing in the condition of equilibrium, the two-part tariff results in a Pareto improvement and an increase of welfare when meeting some certain conditions.
第二部分，从经济学的角度，对网络银行服务进行分析，主要涉及网络银行服务的外部性，网络银行服务的规模经济，最后重点论述了网络银行服务的定价问题。
Part Two analyzes net Banks services from economic perspective, mainly involving the externalities of net Banks services, scale economy of net bank services and the pricing of net Banks services.
第二部分，传统出版物网络营销的定价策略。
The pricing strategy of the cyber-marketing of the conventional publications.
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