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明海大学マクロ経済学：影山純二(学生用)
景気過熱：Y1> YF
• Y = YFまで物価上昇
•景気が過熱しているときにインフレ(持続的な物価上昇)は起こりやすい P
Y AS (長期)
AS (短期) AD YF
E1
E2
Y1
不況：Y1< YF
• Y = YFまで物価下落
•景気が悪いときにデフレ(持続的な物価下落)は起こりやすい P
Y AS (長期)
AS (短期)
AD YF
E1
E2
Y1
スタグフレーション(不況とインフレの同時進行)：1970年代の石油危機など
• YF が突然下がった(長期のASが左へシフト、Y1F →Y2F) –新たなY = YF が達成されるまで物価上昇 ＝ インフレ
–均衡GDP (Y )は景気が過熱していたわけでもないのに減少 ＝ 不況
P
Y AS (長期)
AS (短期) AD E1
E2
Y1F
Y2F
69
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