elasticity and government excise tax revenue
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Elasticity and Government Excise Tax Revenue
Activity 21
Remember this exercise: with the elasticity of demand for the good similar to the elasticity of supply
.10
.05
.20
.15
.50
.45
.40
.35
.30
.25
100 150 200 250 30050
S
D
What is the equilibrium price? $.25
What is the equilibrium quantity? 200
What is the consumer surplus at equilibrium? ((.45-.25)x200)/2 = 20
What is the producer surplus at equilibrium? ((.25-.05)x200)/2 = 20
Assuming this is a competitive market, In what way is this efficient? Consumer and Producer Surplus are equal and at their maximum MSB = MSC
Now let’s put that tax in place
.10
.05
.20
.15
.50
.45
.40
.35
.30
.25
100 150 200 250 30050
S
D
What is the new equilibrium price? $.325
What is the new equilibrium quantity? 125
What is the consumer surplus at the new equilibrium? .45-.32.5=.125
(.125x125)/2 = $9.375What is the producer surplus at the new equilibrium? .175-.05=.125(.125x125)/2 = $9.375
Assuming this is a competitive market, In what way is this efficient? It’s not!!! Although consumer and producer surplus are equal, 75 units of output are lost
S1
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
Total Revenue or PxQ = $50.00 (.25 x 200) at initial equilibrium
supply
demandTotal revenue received by sellers
At equilibrium
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
After Government Excise Tax of $.15, total revenue(.325 x 125)=$40.625
S1 supply+tax
supply
demand
$40.625 Total Revenue
available after tax is levied;
lost revenue to the sellers is $50- 21.875 = $28.125Less the $9.375 tax paid = $18.75
$ .25 x 75 = 18.75
uncollected
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
Government Excise Tax Revenue = $18.75 (.15 x 125)
S1 supply+tax
supply
demand
Government Excise Tax Revenue = $18.75 ((.325-.175)x125) or (.15 x 125)
Consumers pay .075 in higher prices (.325-.25)
Or a total of$9.375 of the tax
Sellers pay .075 in the form of lost revenue (.25-.175)
Or a total of $9.375 of the tax
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
PART A (Figure 21.3) Relatively Inelastic Demand to Supply
demand
supply
S1 supply+tax
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
PART A (Figure 21.3) Relatively Inelastic Demand to Supply
demand
supply
S1 supply+tax
$52.5 Total Revenue available after tax is levied;
revenue gained is $52.0- 50 = $2.5lost revenue to the sellers is $50- 30 = $20.00Less the $7.5 tax paid = $12.5
$ .25
x 75
= 12.5
uncollected
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
PART A (Figure 21.3) Relatively Inelastic Demand to Supply
demand
supply
S1 supply+tax
Government Excise Tax Revenue = $22.50 ((.35-.20)x150) or (.15 x 150)
Consumers pay .10 in higher prices (.35-.25)
Or a total of$15.00 of the tax
Sellers pay .075 in the form of lost revenue (.25-.175)
Or a total of $7.50 of the tax
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
PART B (Figure 21.4) Relatively Elastic Demand to Supply
demand
S1 supply+tax
supply
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
PART B (Figure 21.4) Relatively Elastic Demand to Supply
demand
S1 supply+tax
supply
Government Excise Tax Revenue = $15.00 ((.30-.15)x150) or (.15 x 100)
Sellers pay .10 in the form of lost revenue (.25-.15)
Or a total of $10 of the tax
Consumers pay .05 in higher prices (.30-.25)
Or a total of$5.00 of the tax
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
PART B (Figure 21.4) Relatively Elastic Demand to Supply
demand
S1 supply+tax
supply
$30. Total Revenue
available after tax is levied;
lost revenue to the sellers is
$50 - 15 = $35Less the $10 tax paid = $25
$ .25
x 100
= $25 uncollected
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
PART C (Figure 21.5) Perfectly Inelastic Demand
demand
S1 supply+tax
supply
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
PART C (Figure 21.5) Perfectly Inelastic Demand
demand
S1 supply+tax
supplyGovernment Excise Tax Revenue = $30 ((.40-.25)x200) or (.15 x 200)
Consumers pay .15 in higher prices (.40-.25)
Or a total of$30. of the tax
Sellers pay 0 in the form of lost revenue
Or $0 of the tax
$80 Total Revenue
available after tax is levied;
0 is uncollected
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
PART D (Figure 21.6) Perfectly Elastic Demand
demand
S1 supply+tax
supply
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
PART D (Figure 21.6) Perfectly Elastic Demand
demand
S1 supply+tax
supply
Government Excise Tax Revenue = $7.5
((.25-.15)x50)
or (.15 x 50)
Consumers pay 0 in higher prices
Or a total of $0 of the tax
Sellers pay $7.5 in the form of lost revenue
((.25-.10)x50)
Or a total of all $7.5 of the tax
.25
.30
.35
.20
.15
.10
.05
.40
.50
.45
50 100 150 200 250 300
PART D (Figure 21.6) Perfectly Elastic Demand
demand
S1 supply+tax
supply
$12.5 Total Revenue
available after tax is levied;
lost revenue to the sellers
is $50 - 5 = $45Less the $5 tax paid = $37.5
$ .25
x 150
= $37.5 uncollected
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