[考試] 彈性問題

看板Economics (經濟學)作者 (不黑的小黑)時間15年前 (2010/08/08 14:50), 編輯推噓0(005)
留言5則, 2人參與, 最新討論串4/7 (看更多)
來源: 94政大企研 科目: 個體經計 彈性章節 問題: Suppose that the price elasticity of demand for a product is +1 and that the price elasicity of supply is +1. Assume also that income elasticity of demand is +2. Then and increase in income of 10% will raise equilibrim price by (a) 10% (b) 5% (c) 20% (d) an annual amount that cannt be determined 答案是a 我的想法: 題目已經給了income elasticity = 2 = ΔQd/Qd / ΔM/M 那當ΔM/M 為10%時,表示ΔQd/Qd = 20% 代入price elasticity ΔQd/Qd / ΔPx/Px = 1 所以ΔPx/Px =20%?? 可以這樣解釋嗎?? 這樣解釋跟答案好像又不太對 是少考慮了哪方面?? -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 124.218.29.18

08/09 11:02, , 1F
先假設隱含數模型,再全微化成矩陣,可得
08/09 11:02, 1F

08/09 11:04, , 2F
dQ/Q=[εm/(εd+εs)]*(dM/M) 其中εd=-ΔQd/Qd / ΔP/P
08/09 11:04, 2F

08/09 11:06, , 3F
dQ/Q=[2/(1+1)]*10%=10%
08/09 11:06, 3F

08/09 20:48, , 4F
可以請問我這樣的說法合理嗎?? 感覺隱函數這個有點難
08/09 20:48, 4F

08/09 20:48, , 5F
想到 還是說有更直覺的想法??
08/09 20:48, 5F
文章代碼(AID): #1CNbEPiy (Economics)
文章代碼(AID): #1CNbEPiy (Economics)