彈性問題 - 經濟

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??

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