作者hill9978 (不黑的小黑)
看板Economics
标题[考试] 弹性问题
时间Sun Aug 8 14:49:57 2010
来源: 94政大企研
科目: 个体经计 弹性章节
问题: 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:
题目已经给了income elasticity = 2 = ΔQd/Qd / ΔM/M
那当ΔM/M 为10%时，表示ΔQd/Qd = 20%
代入price elasticity ΔQd/Qd / ΔPx/Px = 1
所以ΔPx/Px =20%?? 可以这样解释吗??
这样解释跟答案好像又不太对 是少考虑了哪方面??
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1F：→ catloveme:先假设隐含数模型，再全微化成矩阵，可得 08/09 11:02
2F：→ catloveme:dQ/Q=[εm/(εd+εs)]*(dM/M) 其中εd=-ΔQd/Qd / ΔP/P 08/09 11:04
3F：→ catloveme:dQ/Q=[2/(1+1)]*10%=10% 08/09 11:06
4F：→ hill9978:可以请问我这样的说法合理吗?? 感觉隐函数这个有点难 08/09 20:48
5F：→ hill9978:想到 还是说有更直觉的想法?? 08/09 20:48