, . apc aps , : , , . 1:
apc + aps = 1.
(I = S) :
: C = C0 + mpc × ,
: S = C0 + mps × ,
: I = I0 k × R + MPI × ,
C0 ( );
( C0) ( , );
I0 , ;
k ;
R ;
(I0 k×R) ;
MPI , .
2.2 , . 2.3 , .
.
. , () () . , , .. , , .
,
Δ ,
ΔAD .
: , .
.
2.4 .
AD AS .
2.5 2.6 , AD AS .