Y=C\mathrm {Y=C}Y=C
Y=C+I\mathrm {Y=C+I}Y=C+I
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)
