MICROECONOMICS ASSIGNMENT 2
Exercise 1
Price ($/unit)
100
120
140
160
180
200
Quantity Supplied (units)
300
400
500
600
700
800
Quantity Demanded (units)
900
800
700
600
500
(1) Demand and supply of fridge
Demand equation
(P = a ) bQ
d
b =
P
Qd
=
20
100
= 0.2
Q
d
= 0 a = P = 300
P = 300 0.2Q
d
Equilibrium quantity:
300 0.2Qd = 40 + 0.2Qs
Q 650 units
E
=
Equilibrium price: P
E
= $170
Supply equation
(P = c + dQs)
d =
P
Qs
=
20
100
= 0.2
Qs
= c = P = 0 40
P = 40 + 0.2Qs
0
50
100
150
200
250
0 200 400 600 800 1000 1200
Price ($/unit)
Quantity (units)
Demand and supply of fridge
Demand Supply
P
E
(2) Surplus/ Shortage
P = 200$
Q
d
= 500 units
Qs = 800 units
Surplus: 300 units
P = 110$
Q
d
= 950 units
Qs = 350 units
Shortage: 600 units
(3) If the supply of fridge is constant the price of electricity increase & Demand
for fridge decrease Demand curve will shift to the left
Quantity demanded for fridge fall 300 units at each price level
Price ($/unit)
100
120
140
160
180
200
Quantity Supplied (units)
300
400
500
600
700
800
New Quantity Demanded (units)
700
600
500
400
300
200
New equilibrium price: P
E’
= $140
New equilibrium quantity: Q
E
= 500 units
0
50
100
150
200
250
0 200 400 600 800 1000 1200
Price ($/unit)
Quantity (units)
Demand and supply of fridge
Demand Supply New demand
E
E'
(4) If the government imposes a tax of $10 per 1 unit of fridge sold Decrease S
New supply equation: P = 40 + 0.2Qs +10
1
P
1
= 50 + 0.2Qs
1
Price ($/unit)
100
120
140
160
180
200
New quantity Supplied (units)
250
350
450
550
650
750
New equilibrium quantity: 50 + 0.2Qs = 300 0.2
1
Qd Q
E1
= 625 units
New equilibrium price: P
E1
= $175
(5) If the government supports for the sellers the amount of $10 per 1 unit of fridge
sold Increase S
New supply equation: P = 40 + 0.2Qs 10
2
P
2
= 30 + 0.2Qs
2
Price ($/unit)
100
120
140
160
180
200
New quantity Supplied (units)
350
450
550
650
750
850
0
50
100
150
200
250
0 200 400 600 800 1000 1200
Price ($/unit)
Quantity (units)
Demand and supply of fridge
Demand Supply New Supply 1
E
E1
New equilibrium quantity: 30 + 0.2Qs = 300
2
0.2Qd Q
E2
= 675 units
New equilibrium price: P
E2
= $165
Exercise 2
(1) An increase in Vietnamese personal income tax rates
0
50
100
150
200
250
0 200 400 600 800 1000 1200
Price ($/unit)
Quantity (units)
Demand and supply of fridge
Demand Supply New Supply 2
E2
E
D
Decrease D
o Equilibrium price decrease
o Equilibrium quantity decrease
D
P
Q
S
E
(2) An income in the price of steel
(3) An improvement in technology in motor vehicle production Increase S
At the same time as a recession hits the Vietnamese economy Decrease D
P
Q
D
S
S
E
Decrease S
o Equilibrium price increase
o Equilibrium quantity decrease
P
Q
D
S
S
D
E
Equilibrium price and equilibrium
quantity change according to D and S
correlation

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MICROECONOMICS ASSIGNMENT 2 Exercise 1 Price ($/unit) 100 120 140 160 180 200 Quantity Supplied (units) 300 400 500 600 700 800 Quantity Demanded (units) 1000 900 800 700 600 500
(1) Demand and supply of fridge Demand and supply of fridge 250 200 PE 150 rice ($/unit) 100 P 50 Quantity (units) 0 0 200 400 600 800 1000 1200 Demand Supply • b = ∆P = 20 = 0.2 Demand equation ∆Qd 100 • Equilibrium quantity: (P = a – bQ • Q d) d = 0 → a = P = 300 → P = 300 – 0.2Q 300 – 0.2Qd = 40 + 0.2Qs d → QE = 650 units • d = ∆P = 20 = 0.2
• Equilibrium price: PE = $17 0 Supply equation ∆Qs 100 (P = c + dQs) • Qs = 0 → c = P = 4 0 → P = 40 + 0.2Qs (2) Surplus/ Shortage • Q P = 200$ d = 500 units → Surplus: 300 units • Qs = 800 units P = 110$ • Qd = 950 units → Shortage: 600 units • Qs = 350 units
(3) If the supply of fridge is constant & t he price of electricity increase → Demand
for fridge decrease → Demand curve will shift to the left Demand and supply of fridge 250 200 E 150 E' rice ($/unit) 100 P 50 Quantity (units) 0 0 200 400 600 800 1000 1200 Demand Supply New demand
❖ Quantity demanded for fridge fall 300 units at each price level Price ($/unit) 100 120 140 160 180 200 Quantity Supplied (units) 300 400 500 600 700 800 New Quantity Demanded (units) 700 600 500 400 300 200
→ New equilibrium price: PE’ = $140
New equilibrium quantity: QE’ = 500 units
(4) If the government imposes a tax of $10 per 1 unit of fridge sold → Decrease S
• New supply equation: P1 = 40 + 0.2Qs +10 → P1 = 50 + 0.2Qs1 Price ($/unit) 100 120 140 160 180 200 New quantity Supplied (units) 250 350 450 550 650 750
• New equilibrium quantity: 50 + 0.2Qs1 = 300 – 0.2Qd → QE1 = 625 units
• New equilibrium price: PE1 = $175 Demand and supply of fridge 250 200 E1 E 150 rice ($/unit) 100 P 50 Quantity (units) 0 0 200 400 600 800 1000 1200 Demand Supply New Supply 1
(5) If the government supports for the sellers the amount of $10 per 1 unit of fridge sold → Increase S
• New supply equation: P2 = 40 + 0.2Qs –10 → P2 = 30 + 0.2Qs2 Price ($/unit) 100 120 140 160 180 200 New quantity Supplied (units) 350 450 550 650 750 850
• New equilibrium quantity: 30 + 0.2Qs2 = 300 – 0.2Qd → QE2 = 675 units
• New equilibrium price: PE2 = $165 Demand and supply of fridge 250 200 E E2 150 rice ($/unit) 100 P 50 Quantity (units) 0 0 200 400 600 800 1000 1200 Demand Supply New Supply 2 Exercise 2
(1) An increase in Vietnamese personal income tax rates P S → Decrease D o Equilibrium price decrease
o Equilibrium quantity decrease E D D’ Q
(2) An income in the price of steel P S’ S E → Decrease S o Equilibrium price increase
o Equilibrium quantity decrease D Q
(3) An improvement in technology in motor vehicle production → Increase S
At the same time as a recession hits the Vietnamese economy → Decrease D P S’ S
Equilibrium price and equilibrium E
quantity change according to D and S correlation D D’ Q