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Consumer surplus bias and the welfare effects of price discrimination

机译：消费者剩余偏见和价格歧视的福利影响

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摘要

A well-known result with important policy implications is that an output increase is a necessary condition for social welfare to increase with third-degree price discrimination. In this paper, we explore the robustness of this result to the introduction of an assumption that is different than the conventional approach, namely preferences not being quasilinear. We show that in the presence of income differences among consumers, the aggregate utility of consumers may increase with price discrimination while total output remains constant. This result questions the general policy recommendation that third-degree price discrimination should be disapproved because it reduces welfare unless output increases. Our result highlights the crucial role of the assumption of quasilinear preferences in standard welfare calculations. In the presence of income differences, consumer surplus may be a biased welfare measure, thus potentially leading to incorrect conclusions when assessing the impact of specific policies.
机译：一个众所周知的具有重要政策含义的结果是，产出增加是社会福利随着三级价格歧视而增加的必要条件。在本文中，我们探索了引入不同于常规方法（即偏好不是准线性）的假设的结果的鲁棒性。我们表明，在消费者之间存在收入差异的情况下，消费者的总效用可能随价格歧视而增加，而总产出保持不变。这一结果对一般政策建议提出质疑，即不应拒绝三级价格歧视，因为除非产出增加，否则三级价格歧视会降低福利。我们的结果强调了准线性偏好假设在标准福利计算中的关键作用。在存在收入差异的情况下，消费者剩余可能是有偏见的福利措施，因此在评估特定政策的影响时可能导致错误的结论。

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