✔ 最佳答案
demand elasticity 係指個market o個d 人對件good 的 price 的升跌時的反應
Ed = %change of Qd / % change of P
Ed=1: unity elastic
Ed>1: elastic
Ed<1: inelastic
Ed=0: perfectly inelastic
Ed= 無限大: perfectly elastic
如果個demand 越elastic 咁個price 升小小, 咁個Qd 就會跌好多la.