|
原帖由 Zend 於 13-6-2008 11:17 發表
piyopiyo 連學術區都搞連post ! 真夠薑
elasticity= deltay/f(xo)/deltax/xo
[f(xo+ deltax)-f(xo)]/f(xo) /deltax/xo
=xo [f(xo+deltax)/delatx ]/f(xo)
lim deltax ->0
elasticity of demand = xo f'(xo)/f ...
Zend伯一提我就記起了
the former is pt elasticity,the latter is arc elasticity
1個係睇某一點ge價格,1個係睇一個較長ge range...
我之前計過,前者係同2個price ge升降個elasticity係唔同,後者係一樣...所以應該用後者[[tk_37]]
聽講AL econ係唔會用呢d咁ge野泥計...[[tk_39]]
[ 本帖最後由 piyopiyo 於 13-6-2008 11:49 編輯 ] |
|