如题所述
2.(1)Y=C+I+G
=100+0.8(Y-T+Tr)+50+200
=350+0.8(Y-250+62.5)
=200+0.8Y
解得均衡收入Y=1000.
(2)
3.IS:
S=y-c=y-{40+0.8(y-50+50)}=0.2y
I=S即140-10r=0.2y
y=900-50r ①
LM:L=M即150=0.2y-5r
y=750+25r ②
联立①②,解得r=2,y=800,i=120.