《高级微观经济学Advanced Microeconomics》PPT课件：Lecture 15 public goods and externality

Public goods Continuous case Benchmark max au+(I-a)u, 8182 +(1-a) aG G ox C G OG Ou,/Ou Ou/a aG/ Ox, aG/Ox

Public goods • Continuous case: • Benchmark: 1 2 1 2 , max (1 ) g g au a u + − 1 2 1 1 1 2 2 2 (1 ) (1 ) (1 ) u u u a a a G G x u u u a a a G G x    + − =       + − = −    1 1 2 2 1 2 1 u u u u G x G x      + =    

Public goods · Samuelson condition ∑(G)=c(G)

Public goods • Samuelson condition: 1 ( ) ( ) I i i u G c G   =    =