Question abt Price Elasticity

2010-03-11 3:52 am

我有題econ唔識做
希望有人可以教到我

Qd = 700-100P

calculate the price of elasticity of demand by two ways
a]] %change in Qd / %change in P
b]] (change in Q/ change in P) x (P/Q)

我個tutor得出黎既answer係inelastic demand.

究竟係點計架呢？

PLUS, 我想問，2條公式係一樣既
咁點解要有2條公式呢？

希望有人答到我，many thanks

回答 (1)

garlic2010

2010-03-11 2:06 pm

✔ 最佳答案

A 同B 不是兩條公式而是一條，A 同B 係同一樣野。

%change in Qd = change in Qd / Q

%change in P = change in P / P

%change in Qd / %change in P = (change in Qd / Q) / (change in P / P)

%change in Qd / %change in P = (change in Qd / Q) * (P / change in P)

%change in Qd / %change in P = (change in Qd / change in P) * (P / Q)

一條 demand equation 在每一個價格都有不同的 elasticity，elasticity 同需求曲線斜度無關，價格越高 elasticity 越高，一定要有某一價格或某段價格才可計算到 elasticity。

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