作者noqinoqi (咘奇咘奇)
看板TransEcoAcc
标题Re: [经济] 价格弹性的问题
时间Sun Dec 13 14:16:49 2009
※ 引述《bluelatte (小咖)》之铭言:
: 科目:经济
: 问题:When a linear demand curve can be expressed as Q=a-bP , which region
: corresponds to the elastic portion of the demand curve ?
若需求曲线为直线,其方程式为 Q = a - bP
则线上哪一个部份的需求弹性大於1(有弹性, elastic)?
: (A) price ranges from a/b to a/2b
纵轴截距至中点;
: (B) price ranges from a/2b to 0
中点至横轴截距
: (C) quantity ranges from a/2 to a
纵轴截距至横轴截距
: (D) only where quantity equals a/2
需求曲线的中点
解题概念:以需求曲线的中点作分际,
(1) 纵轴截距(P = a/b, Q = 0)至中点(P = a/2b, Q = a/2)之间的线段,为有弹性;
(2) 中点的弹性为1;
(3) 中点至横轴截距(P = 0, Q = a)为无弹性;
故,本题应选 A
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