假设某个发展中国家的边际储蓄倾向为0.3,边际进口倾向为0.2,则
A.当该国出口值为10亿时,该国国民收入增加10亿
B.当该国出口值为10亿时,该国国民收入增加20亿
C.当该囝出口值增加10亿时,该国国民收入增加10亿
D.当该国出口值增加10亿时,该国国民收入增加20亿
正确答案是D
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