假设一户家庭在鸡肉的价格为每磅2美元时每年购买100磅,当鸡肉的价格涨至2.2美元时,全家的鸡肉消费就降至每年85磅。问鸡肉对于该家庭的需求价格弹性是多少?
(2.2-2)/2 = 0.1 (1 分) (85-100)/100 = -0. 15 (2 分) -0.15/0.1 = -1.5 (2 分)
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