Consumption Externalities and Pigouvian Ranking - A Generalized Cobb-Douglas Example
Consumption Externalities and Pigouvian Ranking - A Generalized Cobb-Douglas Example
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消费外部性和庇古排名 - 广义的柯布-道格拉斯例子
DOI：
10.2139/ssrn.1127374
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
R. Wendner
中科院分区：
文献类型：
--
作者：
R. Wendner
本文分析了消费外部性对“庇古排名”的影响，根据庇古排名，公共产品供给的次优水平\emph{小于}第一优水平。消费外部性给庇古排名带来了例外。当对私人物品的偏好（柯布-道格拉斯）和公共物品的偏好是弱可分的时候，我们确定了推翻庇古排名的两个必要和充分条件：(i)消费产生\emph{负}外部性，（ii）私人物品的效用不太凹。如果偏好在公共产品中是\emph{强}可分的，那么当且仅当次优消费价格低于修正（庇古）消费价格时，庇古排名颠倒。
This paper analyzes the impact of consumption externalities on the ``Pigouvian ranking,'' according to which the second-best level of public good provision is \emph{smaller} than the first-best level. Consumption externalities introduce exceptions to the Pigouvian ranking. Two necessary and sufficient conditions for reversal of the Pigouvian ranking are identified, when preferences for private goods (Cobb-Douglas) and the public good are weakly separable: (i) consumption generates a \emph{negative} externality, (ii) utility is not too concave in the subutility of private goods. If preferences are \emph{strongly} separable in the public good, the Pigouvian ranking is reversed if and only if the second-best consumption price is lower than the corrective (Pigouvian) consumption price.