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โครงสร้างตลาด PowerPoint PPT Presentation


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หน่วยที่ 5. โครงสร้างตลาด. ตลาด ( Market ). ตลาด หมายถึง การติดต่อซื้อขายสินค้าซึ่งกันและกัน ซึ่ง ความหมายดังกล่าวข้างต้นตลาดจะมีสถานที่หรือไม่มีสถานที่ก็ได้. ผู้ซื้อ. ผู้ขาย. สินค้า. โครงสร้างตลาด. โครงสร้างตลาด. ตลาดแข่งขันสมบูรณ์. ตลาดแข่งขันไม่สมบูรณ์. ตลาดกึ่งแข่งขัน กึ่งผูกขาด.

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5


( Market )



-

-

-

-

-

-


  • 1. ( Perfect Competitive Market )

  • 2. ( Monopolistic Competition )

  • 3. ( Oligopoly )

  • 4. (Monopoly )


  • 1. ( Perfect Competitive Market )

    2. ( Monopsonistic Competition )

    3. ( Oligopsony )

    4. ( Monopsony )


1.

2.

3.

4.

5.


P

P

S

5

P , AR , MR , d

D

Q

Q

150

0

0

1

4


P Q TR = P.Q AR = TR MR = TR

Q Q

5 1 5 5 5

5 2 10 5 5

5 3 15 5 5

5 4 20 5 5

5 5 25 5 5

5 6 30 5 5

5 7 35 5 5

5 8 40 5 5

5 9 45 5 5

5 10 50 5 5

AR = MR = P


P

MC

ATC

MC = MR

(TR) = OQ1AP1

(TC) = OQ1BC

= CBAP1

A

P,AR,MR,d

(5)

P1

(4)

C

B

Q

Q1

0


P

P

S

S1

5

P , AR , MR , d

4

P1, AR1 , MR1 , d1

D

Q

Q

150

0

0

1

4


P

P

S

S1

S2

5

P , AR , MR , d

4

P1, AR1 , MR1 , d1

3

P2, AR2 , MR2 , d2

D

Q

Q

0

0

1

4

Q2

Q3

Q1


P

MC

ATC

A

(4)

P1 ,C

P,AR,MR,d

Q

Q1

0


MC

P

ATC

(5)

C

(4)

P1

P,AR,MR,d

Q

Q1

0


P ,

5

d = AR = MR = P

Q

0


P ,

D

Q

0


P ,

TR

Q

0


LRMC

LRATC

P = AR = MR

P

0

Q

LMC = LAC = P = AR = MR


TC = 4,000 + 5 Q + 0.1 Q2

MC = 5 + 0.2 Q

Q=

1. 55 /

2. 65 /


( )

MC = MR

55 = 5 + 0.2 Q

0.2 Q = 50

Q = 250

= TR - TC

= 55(250) - 4,000 - 5(250) - 0.1(250)2

= 2,250


( )

65 MC = MR

65 = 5 + 0.2 Q

0.2Q = 60

Q = 300

= TR - TC

= 65 (300) - 4,000 - 5 (300) - 0.1(300)2

= 5,000


,

TC

TR

0

Q1

Q2

Q3

,

MC

ATC

P

AR , MR , P

C

0

Q1

Q2

Q3

50

TNP

0

Q1

Q2

Q3


,

TC

TR

0

Q1

Q2

,

MC

ATC

P,C

AR , MR , P

0

Q1

Q2

TNP

0

Q1

Q2


,

TC

TR

TVC

0

Q1

,

MC

AFC

ATC

AVC

6

AR , MR , P

5

4.5

0

Q1

Q1

0

TFC


,

TC

TVC

TR

0

Q1

,

MC

ATC

D

AVC

E

P

AR , MR , P

A

0

Q1

Q1

TFC

100


P

TC

TR

Q

0

Q

P

TC

TR

Q

0

Q

P

TC

TR

Q

0

Q


1.

2. -


3.

3.1

3.2

3.5


1.

2.

3.


(Monopoly)

1.

2.

3.

4.


(Monopoly)

5. Demand Demand

6.

Demand


1.

2.

3.

4.

5.

6. (Patent right)


P

P

D = d

D

MR

Q

Q

0

0


P

P

MC

ATC

P1

C

P,D,AR

P,D,AR

MR

MR

Q

Q

Q1

0

0


P

P

MC

MC

ATC

C,P1

C

ATC

ATC

P1

P,D,AR

P,D,AR

MR

MR

Q

Q

Q1

0

0


P

TR

MC

MR

TC

Q

0

1

2

3

4

5

6

7

8

9

5.00

4.80

4.60

4.40

4.20

4.00

3.80

3.60

3.40

3.20

3.00

0.00

4.80

9.20

13.20

16.80

20.00

22.80

25.20

27.20

28.80

30.00

-

4.80

4.40

4.00

3.60

3.20

2.80

2.40

2.00

1.60

1.20

0.00

3.75

7.45

11.10

14.70

18.00

20.90

23.80

27.20

30.60

35.00

-

3.75

3.70

3.65

3.60

3.30

2.90

2.90

3.40

3.50

4.40

10


TR= 300 Q - 0.001 Q2

TC= 9,000,000 + 20 Q + 0.0004 Q2

MR = MC

MR= 300 - 0.002 Q

MC= 20 + 0.0008 Q


300 - 0.002 Q = 20 + 0.0008 Q

0.0028 Q = 280

Q = 100,000

P = TR

Q

= 300 Q - 0.001 Q2

Q

= 300 - 0.001 Q

= 300 - 0.001 (100,000)

= 200


= TR - TC

= 300Q - 0.001Q2 - 9,000,000 - 20Q - 0.0004Q2

= - 0.0014Q2 + 280Q - 9,000,000

= - 0.0014 (100,000)2 + 280 (100,000) - 9,000,000

= 5,000,000


1.

2.

3.

4.


3

1. (First degree price discrimination)

P

= APN

A

MC

N

P

L

P,D,AR

MR

Q

0

M


2. (Second degree price discrimination)

P

A

P1

(10)

B

(8)

P2

C

(6)

P3

AR

Q

1,500

2,000

0

1,000


3. (Third degree price discrimination)

A

B

P,TR

P,TR

P,TR

MC

PA

PB

C

E

ART

ARA

MRA

MRB

ARB

MRT

Q

Q

Q

0

qA

0

qB

0

Q = qA + qb


1.

,

MC

ATC

E1

P1

E

P2

B

C

AR , P

MR

0

Q1

Q2


MC = MR

OP1 OQ1 P1E1BC

OP1 (Monopoly Price)

OP2

(Fair Price) AR = ATC


2.

2.1

,

MCT

ATCT

MC

ATC

PT

P

CT

C

AR , P

MR

0

QT

Q


2.2 (

)

MC = MCT

,

ATCT

ATC

A

P

CT

D

B

C

AR , P

MR

0

Q


TC

TC , TR

TR

TFC

Q

0

Q0

Q1

Q2

TC , TR

MC

ATC

A

P

B

C

AR = P = D

MR

Q

0

Q1

Q2

E

TNP

F

0

Q

Q0

Q1

Q2

TFC


TC , TR

TC

TR

TFC

Q

0

Q0

Q1

TC , TR

MC

ATC

SP

AR

MR

Q

0

Q1

R

TNP

0

Q

Q1

TFC


TC

TC , TR

TVC

S

R

TR

N

TFC

Q

0

Q1

MC

TC , TR

ATC

D

AVC

E

P

A

B

C

AR

MR

Q

0

Q1

Q1

Q

G

TFC

TFC

L

TR > TVC


TC

TC , TR

TVC

R

TR

S

TFC

Q

0

Q1

MC

TC , TR

ATC

D

E

AVC

P

A

AR

MR

Q

0

Q1

0

Q

Q1

TFC

N

TR = TVC


1.

2.


P

P

MC

MC

ATC , AC

ATC , AC

A

P

C,P

B

C

P,D,AR

P , D

MR

MR

Q

Q

Q

Q

0

0


P

MC

AC , ATC

B

C

AVC

A

P

E

Z

P , D

MR

Q

Q

0


,

SMC

LMC

LAC

SAC

P

AR , P , D

MR

0

Q


SME = LMC = MR SAC = LAC


(Oligopoly)

Pure Oligopoly

Differentiated

Oligopoly


(Oligopoly)

-

-

-


(Oligopoly)

P,C

P,C

P,C

MC1

MC2

MC

P

P

P

D

MR

D1

D2

MR1

MR2

Q

Q

Q

0

Q1

0

Q2

0

Q1+2


P , C

MC

P

D , P

MR

Q

0

Q

(Oligopoly)


P

MCL

MCT

PL

DT

DL

MRL

Q

0

QL

QT

12

20

(Oligopoly)


P

P

d,P,AR,MR

d,D,P

Q

Q

0

0

P

P

d,P

d,P

Q

Q

0

0


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