[考試] 電漿電視的弧彈性絕對值大於1，算需求量

看板Economics作者generalman (筋肉人二世將軍人)時間12年前 (2012/02/27 19:33)推噓3(3推 0噓 2→)

留言5則, 3人參與討論串1/2 (看更多)

來源: 93學年度技術學院專業科目(一) 管理類(二)管理類(四) 經濟學科目:經濟學問題: 假設某型電漿電視為正常財，消費者對其需求的弧彈性之絕對值大於1，當價格由每台20 萬元降為15萬元時，需求量會如何變動? (A)增加，幅度小於14% (B)減少，幅度大於28% (C)增加，幅度大於28% (D)減少，幅度小於14% 答案是:C 我的想法:令P1=200,000 P2=150,000 原本的需求量Q1 後來的需求量Q2 套入弧彈性的公式，｜(Q2-Q1/Q2+Q1) 整個除以2｜ _____________________________ > 1 ｜(P2-P1)/(P2+P1) 整個除以2｜ = = = = = = = = = = = = = = = = = = = = = = = = == == ｜(Q2-Q1/Q2+Q1)｜｜(Q2-Q1/Q2+Q1)｜ ____________________ = __________________ >1 ｜-50,000/350,000｜ 1/7 = = = = = = = = = = = = = = = = = == === = = = = = = = = = = = = = = ｜(Q2-Q1/Q2+Q1)｜>7 所以 (Q2-Q1/Q2+Q1)>7 或 (Q2-Q1/Q2+Q1)<-7 = = = = = = = = = = = = = == = = = = = = = = = = = = = = = = = = = = 算出來Q2 >4/3 Q1 但怎麼會是大於28%呢？高手可以幫我解惑嗎？謝謝。 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 111.242.176.29

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