TRẠNG THÁI THIẾU HỤT
• giá thị trường thấp hơn giá cân
bằng:
P
t
< P
e
P ↓=> Q
S
↓( luật S);
=> Q
D
↑(luật D)
Q
S
< Q
D
thiếu hụt (dư cầu)
ΔQ = Q
D
- Q
S
• ví dụ: Q
D
= 34 – 4P, Q
S
= 5P – 2
nếu P = 3 => dư cầu
Q = (34
–
4.3)
–
(5.3
–
2) = 9
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P
D
F
-
X
C
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w
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w
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d
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c
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P
D
F
-
X
C
h
a
n
g
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V
i
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w
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w
w
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2. Thay ®æi tr¹ng th¸i c©n b»ng
S
D
S’E
E’
Q
P
Q
E
Q
E’
P
E
P
E’
P
Q
S
D
D’
E
E’
P
E’
P
E
Q
E
Q
E’
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P
D
F
-
X
C
h
a
n
g
e
V
i
e
w
e
r
w
w
w
.
d
o
c
u
-
t
r
a
c
k
.
c
o
m
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P
D
F
-
X
C
h
a
n
g
e
V
i
e
w
e
r
w
w
w
.
d
o
c
u
-
t
r
a
c
k
.
c
o
m
Thay ®æi tr¹ng th¸i c©n b»ng- Sù
dÞch chuyÓn
P
Q
S
D’
D
E’
E
P
E
P
E’
Q
E’
Q
E
S’
D
SE’
E
Q
P
Q
E’
Q
E
P
E’
P
E
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P
D
F
-
X
C
h
a
n
g
e
V
i
e
w
e
r
w
w
w
.
d
o
c
u
-
t
r
a
c
k
.
c
o
m
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P
D
F
-
X
C
h
a
n
g
e
V
i
e
w
e
r
w
w
w
.
d
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c
u
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t
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a
c
k
.
c
o
m
Thay ®æi tr¹ng th¸i c©n b»ng
Khi S↑ + D↑ => Q
CB
↑ , P không XĐ: ↑, ↓ , const
S
S’
D
D’
P
e
Q
e
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P
D
F
-
X
C
h
a
n
g
e
V
i
e
w
e
r
w
w
w
.
d
o
c
u
-
t
r
a
c
k
.
c
o
m
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P
D
F
-
X
C
h
a
n
g
e
V
i
e
w
e
r
w
w
w
.
d
o
c
u
-
t
r
a
c
k
.
c
o
m
Thay ®æi tr¹ng th¸i c©n b»ng- Sù
dÞch chuyÓn
S’
D’
S
E’
E
Q
P
Q
E’
Q
E
P
E
D
P
E’
P
Q
S
D’
D
E’
E
P
E
Q
E
= Q
E’
S’
P
E’
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P
D
F
-
X
C
h
a
n
g
e
V
i
e
w
e
r
w
w
w
.
d
o
c
u
-
t
r
a
c
k
.
c
o
m
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P
D
F
-
X
C
h
a
n
g
e
V
i
e
w
e
r
w
w
w
.
d
o
c
u
-
t
r
a
c
k
.
c
o
m