. , , . . , .. , , . . , . , .
. . . . , . , , , . , . ,
, . , . ( ) . - , , . .
. , 40- . . ( , ).
, , . , . , K/Y . , , .
(∆I), , :
∆YAD = ∆I m = ∆I 1/1 MPC = ∆I 1/ MPS,
|
|
m ;
MP ;
MPS .
:
∆YAS = δ ∆,
δ ( ).
∆ (∆I), :
∆YAS = δ ∆I
, .. AD = AS. , :
∆I / MPS = δ ∆I ∆I / I = δ MPS,
.. .
δ , , , , MPS ( ).
, I = S,
S = MPS x Y, MPS, , , :
∆Y/ Y = ∆K / K = ∆I / I = δ MPS
, . , , . , ∆Y/ ∆.
:
∆I / It-1 = ∆Y/ Yt-1 = ∆K / Kt-1 = ∆L / Lt-1 = δ MPS
, .
. , , .
1939 . , , . : .
, .
( ). :
, ;
(∆ K/Y) ;
.
, () () , .
It = α(Yt Yt 1),
α .
, , :
) , ;
|
|
) , ;
) , . .
:
It α(Yt Yt 1)
Yt d = ── = ──────── → AD
MPS MPS
, , ..
s s
Yt-1 Yt 2
Ys = Ys (n ────────── +1) → AS
t t-1 Ys
t-2
n = 1 .
. , , .. n =1, :
Yt d = Yt s = AD = AS
AD AS .
d d s s
α(Yt Yt 1) Yt-1 Yt 2
──────── = Ys (n ────────── +1)
MPS t-1 Ys
t 2
, :
∆Y MPS
─── = ────── = ──────────
Yt 1 α MPS
(Gw) . :
();
;
;
(Gn). , (Gn). , . .
, .
-. . , (MPS), .
, , , ( ), .
-. . 1920-1950- ., (50- 70- .) . .