個經推導 需求函數與彈性 - 經濟
By Lily 
at 2017-05-01T14:32
at 2017-05-01T14:32
Table of Contents
http://i.imgur.com/qSFo918.jpg
http://i.imgur.com/F5hMzAR.jpg
想請問一下各位
小弟這邊推導每次都卡住
照理來說 不是Py也是裡面有px的函數嗎
為什麼會省略呢?
解答是給 -a就是需求彈性
為什麼呢
希望各位幫幫忙QQ
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