曼昆微观经济学分册英文版 教材PPT
Analysis of a Negative Externality 负的外部性的分析P $54 3 2 1 0 0 10 20 D
The market for gasoline
Social The socially cost optimal quantity is 20 gallons. S
At any Q < 20, value of additional gas exceeds social cost At any Q > 20, social cost of the last gallon is greater than its value11
2530 Q (gallons)