推 applexgreen:專業 12/19 17:13
※ 引述《bluelatte (小咖)》之銘言:
: 科目:經濟
: 問題:When a linear demand curve can be expressed as Q=a-bP , which region
: corresponds to the elastic portion of the demand curve ?
若需求曲線為直線,其方程式為 Q = a - bP
則線上哪一個部份的需求彈性大於1(有彈性, elastic)?
: (A) price ranges from a/b to a/2b
縱軸截距至中點;
: (B) price ranges from a/2b to 0
中點至橫軸截距
: (C) quantity ranges from a/2 to a
縱軸截距至橫軸截距
: (D) only where quantity equals a/2
需求曲線的中點
解題概念:以需求曲線的中點作分際,
(1) 縱軸截距(P = a/b, Q = 0)至中點(P = a/2b, Q = a/2)之間的線段,為有彈性;
(2) 中點的彈性為1;
(3) 中點至橫軸截距(P = 0, Q = a)為無彈性;
故,本題應選 A
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