Y=C+I+G+(X+M) \mathrm {Y=C+I+G+(X+M)}Y=C+I+G+(X+M)
Y=C+I+G \mathrm {Y=C+I+G}Y=C+I+G
Y=C+I+G+(X−M) \mathrm {Y=C+I+G+(X-M)}Y=C+I+G+(X−M)
Y=C+I \mathrm {Y=C+I}Y=C+I
