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本文通过分析得出主动实施、方向上为正向的价格歧视能够使寡头厂商利润在短期和长期都能达到帕累托最优状态;主动实施、方向上为负向的价格歧视使寡头厂商利润在短期不能达到帕累托最优状态,在长期内能够达到;被动实施、方向上为负向的价格歧视使寡头厂商利润在短期和长期均不能达到帕累托最优状态。进而验证只要实施价格歧视就一定能够达到帕累托最优的论断不正确。
In this paper, we find that proactive implementation and positive price discrimination can make the profits of oligopolists reach the Pareto optimality in the short and long term. The price discrimination that takes the initiative to implement and the negative direction makes the profits of oligopolists In the short term can not reach the Pareto optimal state, in the long term can be achieved; passive implementation, the direction of the negative price discrimination so that oligopolistic firms profit in the short and long term can not reach Pareto optimal state. Then we can verify that Pareto’s optimal conclusion can not be achieved if price discrimination is implemented.