105台大個經 - 經濟
By Mason
at 2017-02-05T19:55
at 2017-02-05T19:55
Table of Contents
來源: 105台大經研
科目:個經
問題:http://i.imgur.com/fzENkt0.jpg
我的想法:
player 1是第一家店
player 2是第二家店
player 3是第三家店
player 4是買家
A是買 S 是離開不買 K是繼續走
http://i.imgur.com/P8tsUdS.jpg
解出來是θ=p1*=p2*=p3*
補習班是p1*=p2*+x=p3*+2x
我的答案是BE
但補習班的答案是AE
覺得A是錯的
均衡會發生在對買家而言兩個策略都一樣的地方
p3*=θ , p2*=θ+ x , p1*=θ+ 2x
但如果p2*=θ+ x
在period 2 θ-p2-x=θ-θ-x-x=-2x<-x
period 1 -2x<0
買家會在第一家店就直接選擇不買離開
第二家也是,直到第三家才買
這樣算是均衡嗎
覺得怪怪的 @@
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