, . , ᒺ. , , , . , .
, . , , , . . ³ C: Y (APC). AC: AY = MPC, MPC. MPC . 0 < MPC < 1.
. S = Y - C, S - , Y - , C - . C = f (Y), S = Y - f (Y). APS = S: Y. MPS = AS: AY. MPS .
. : C + S = Y. APC APS : APC + APS = 1, ^ + y ~ : AC + AS = AY. MPC MPS :