浙江大学：《高级微观经济学》课程PPT教学课件（英文版）Lecture 14 public goods and externality

Public goods Continuous case Benchmark max au,+(l-au g182 OG G a+(1-a) 02=(-a)m G G Ou,/auau/au → aG/ Ox, aG/ax

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 ∑ 2(G)=c'(G

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