單項選擇題如果在凱恩斯開放經(jīng)濟模型中乘數(shù)為2.0,下列哪個選項為其相應(yīng)的邊際消費傾向和邊際進口傾向()

A.MPC=0.7;MPM=0.2
B.MPC=0.3;MPM=0.2
C.MPC=0.8;MPM=0.2
D.MPC=0.5;MPM=0.2


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