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第450章 无畏损失(1 / 2)

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无畏损失(Deadweight Loss, DWL)是经济学中的一个概念,用来描述由于资源配置的无效率所导致的社会总福利的净损失。它通常发生在市场未能达到帕累托最优时,例如因税收、价格管制、垄断或外部性等引起的市场失灵。

1. 无畏损失的定义

无畏损失是指在市场干预或市场失灵的情况下,社会总剩余(消费者剩余 + 生产者剩余)减少的部分,这部分损失是没有被其他任何主体获得的。

2. 无畏损失的形成原因

?价格管制:如价格上限或下限(如租金控制或最低工资)会导致供需不平衡,资源无法有效分配。

?税收:政府征税提高了商品的价格,减少了市场交易量,导致消费者和生产者剩余下降。

?垄断:垄断企业通过提高价格减少产量,导致社会总福利损失。

?外部性:市场未能完全反映生产或消费的社会成本或社会收益,例如污染或公共物品问题。

3. 无畏损失的图示

在供需图中,无畏损失是因市场失灵或干预导致的交易减少部分的社会福利损失。通常表现为一个三角形区域。

图解:

1.横轴:交易数量 。

2.纵轴:价格 。

3.无畏损失区域:在原均衡交易量和受干预后交易量之间的部分,位于供给曲线和需求曲线之间的三角形。

4. 无畏损失的计算

无畏损失的大小可以用三角形面积公式计算:

?交易量减少:干预前后的交易量差。

?价格扭曲:干预导致的价格变化幅度。

5. 实例分析

例1:税收导致的无畏损失

假设某商品的均衡价格为 10 元,交易量为 100 单位,政府征税 2 元后,交易量降至 80 单位:

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