เฉลยแบบฝึกหัดเตรียมความพร้อมก่อนเรียน บทที่ 2 The Basics of Supply and Demand. Q&A: Supply & Demand. Q1. การที่ Supply เลื่อนระดับดังภาพ เกิดขึ้นเนื่องจากสาเเหตุใดบ้าง ?. A: Input Prices Technology Expectations Weather. Q2. ขอให้แสดง สมการ ของ Supply ?. A: Q s = Q s (P)
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2 The Basics of Supply and Demand
Q&A: Supply & Demand
Q1. Supply ?
Q2. Supply ?
A: Qs= Qs (P)
Qs= f(P,w,)
Q&A: Supply & Demand
Q3. Demand ?
Q4. Demand ?
A: QD= QD(P)
Qx = f(Px, Py, I, ..)
Q&A: Supply & Demand
Q5. DemandQx = f(Px, Py, Pz, I, ..) 5.1 X ? 5.2 X Y ? ? ? 5.3 X Z ? ? ?
A: X (Normal Good) ....
A: Y X
X Y (Complements)
A: Z X
X Z (Substitutions)
Q&A: Supply & Demand
Q6. Demand X ?Qx = f(Px, I, ..)
A: X (Inferior Good ) ....
: Demand
2) The Market Mechanism
Q&A: Equilibrium
Q7. P1 ?
A:
S
Surplus
P0
Shortage
D
Q0
A7.
=> excess demand or excess supply
(/)
P1
E
P2
()
Figure: Supply and Demand.
3) Changes in Market Equilibrium
S
S
P2
P1
D
D
Q1
Q2
Q8. ?
A8.
( /)
()
Figure: New Equilibrium Following Shift in Demand and Supply.
: Changes in Market Equilibrium
Q9. (Elasticity) ?
( Price elasticity of demand)
( Price elasticity of demand)
( Crossprice elasticity of demand)
(Price elasticity of supply)
Q10. ?
A9.
4) Elasticities of Supply and Demand
(Elasticity)
Percentage change in one variable resulting from a 1percent increase in another
( Price elasticity of demand : Ep)
Percentage change in quantity demanded of good resulting from a 1percent increase in its price
Ep = (%Q)/(% P)
4) Elasticities of Supply and Demand
Q
Q
x 100
%Q Q =
P
P
%P P =
x 100
Ep = (%Q)/(% P)
4) Elasticities of Supply and Demand
Ep < or = 1
Ep >1
Q = a  bP
Q = 8  2P
Ep = _
Ep = _1
2
Ep = 0
4
A10.
(/)
Q = 8  2P
4
()
8
Figure: Linear Demand Curve.
D
P*
A11.
(/)
Q11. ? ()
()
Figure: Infinitely Elastic Demand.
D
Q*
Q12. 0 ? ()
A12.
(/)
()
Figure:Completely Inelastic Demand.
A13.
()


EpD
4) Elasticities of Supply and Demand
(Price elasticity of demand)
Percentage change in quantity demanded of
good resulting from a 1percent increase
in income
4) Elasticities of Supply and Demand
( Crossprice elasticity of demand)
Percentage change in quantity demanded
of one good resulting from a 1percent
increase in the price of another
4) Elasticities of Supply and Demand
(Price elasticity of supply)
Percentage change in quantity supplied of good resulting from a 1percent increase in its price
EpS = (%Qs)/(% P)
A14.
=>
2
2
1. D & S Supply: QS = 1800 + 240P
Demand: QD= 3550  266P
. P Q PE , QE ()
. D S .
?
(3.46)
(2,630)
(0.35)
(0.32)
2
1. D & S Supply: QS = 1800 + 240P
Demand: QD= 3550  266P
. P Q PE , QE ()
. D S .
?
4 D
2