ec120 review questions for final
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EC120 – Review Questions for the Final 1
Question One
Assume that a market is initially in equilibrium. If the demand curve shifts left and the supply curve shifts right, then the equilibrium price _______ and the equilibrium quantity _______: (each blank is separated by a semi-colon)a) Falls; may rise, fall or remain constantb) Rises; may rise, fall or remain constantc) Rises, falls or remains constant; fallsd) Rises, falls or remains constant; rises
EC120 – Review Questions for the Final 2
Question One
Solution
a) - ExplanationDemand curve shifts leftEquilibrium price falls and equilibrium quantity falls
Supply curve shifts rightEquilibrium price falls and equilibrium quantity rises
Price definitely fallsAmbiguous effect is on equilibrium quantity
EC120 – Review Questions for the Final 3
Question Two
Suppose Carol’s Candid Cameras wants to increase its total revenue. If the firm lowers the price of cameras by 2 percent, Carol must be predicting that the quantity:a) Demanded will decrease by less than 2 percentb) Supplied will increase by more than 2 percentc) Supplied will decrease by less than 2 percentd) Demanded will increase by more than 2 percent
EC120 – Review Questions for the Final 4
Question Two
Solution
Answer d)
If D is elastic: P, Q will by a larger %, so TR
EC120 – Review Questions for the Final 5
Question Three
If the price of a good is not affected by a sales tax, then:a) Supply is perfectly elasticb) Demand is perfectly elasticc) Elasticity of supply is greater than elasticity of
demandd) Elasticity of demand is greater than elasticity of
supplye) None of the above
EC120 – Review Questions for the Final 6
Question Three
Solution:
Perfectly Elastic Demand Curve
Demand is perfectly elastic. With no tax, price is $5 and the quantity is 100. At tax of $0.75 shifts the supply curve to S + tax. The price remains at $5 and the quantity decreases to 50. Sellers pay the entire tax.
Price
Quantity 100
D
S + tax
$5.00
S
50
$4.25
EC120 – Review Questions for the Final 7
Question Four
Use these diagrams to answer Question Four (p.8)
EC120 – Review Questions for the Final 8
Question Four (continued)
Suppose a sales tax of $1 is imposed. In which market would the seller pay the highest portion of the tax?a) (a)b) (b)c) (c)d) (d)e) All markets equally
EC120 – Review Questions for the Final 9
Question Four
Solution
Answer c)
Although it is true that the most inelastic supply curve bears the highest tax burden, as is the case in Diagram (d); this is not the correct response.
In Diagram (d) the demand curve is perfectly inelastic and so the consumer bears the entire tax burden.
Diagram c) has the second most inelastic supply curve
EC120 – Review Questions for the Final 10
Question Five
Question Five refers to Table 1 which represents Sam’s Marginal Utility schedules for bananas and apples:
Table 1:
Bananas ApplesQuantity
Marginal Utility
MUB/PB Quantity
Marginal Utility
MUA/PA
1 30 1 402 24 2 343 18 3 244 12 4 165 6 5 86 0 6 0Assume the price of bananas PB is $1 a kilogram and the price of apples PA is $2 a kilogram. Sam’s budget for bananas and apples is $10.
What is Sam’s marginal utility per dollar spent at each quantity of apples and bananas?
What is the utility maximizing combination of bananas and apples for Sam?
EC120 – Review Questions for the Final 11
Question Five
Solution
Table 1:
Bananas PB = $1 Apples PA = $2Q Margina
l UtilityMUB/PB Q Margina
l UtilityMUA/PA
1 30 30/1 =30 1 40 40/2 = 402 24 24/1 = 24 2 34 34/2 = 173 18 18/1 = 18 3 24 24/2 = 124 12 12/1 = 12 4 16 16/2 = 85 6 6/1 = 6 5 8 8/2 = 46 0 0/1 = 0 6 0 0/2 = 0Sam will consume 4 bananas and 3 apples at his utility maximizing combination.
This combination exhausts Sam’s entire income.
($1 x 4) + ($2 x 3) = $10
EC120 – Review Questions for the Final 12
Question Six
If the price of bananas rises to $2 a kilogram, how does Sam’s marginal utility per dollar for bananas change? Fill in Table 2 with the new marginal utility per dollar spent for bananas. Assume Sam’s income remains the same.
Table 2
Bananas ApplesQuantity Margina
l UtilityMUB/PB Quantity Margina
l UtilityMUA/PA
1 30 1 402 24 2 343 18 3 244 12 4 165 6 5 86 0 6 0
At the price of $2 a kilogram for bananas, what is the new utility maximizing combination of bananas and apples for Sam?
EC120 – Review Questions for the Final 13
Solution
Table 1:
Bananas PB = $2 Apples PA = $2Q Margina
l UtilityMUB/PB Q Margina
l UtilityMUA/PA
1 30 30/2 = 15 1 40 40/2 = 402 24 24/2 = 12 2 34 34/2 = 173 18 18/2 = 9 3 24 24/2 = 124 12 12/2 = 6 4 16 16/2 = 85 6 6/2 = 3 5 8 8/2 = 46 0 0/2 = 0 6 0 0/2 = 0Sam will consume 2 bananas and 3 apples at his new utility maximizing combination.
This combination exhausts Sam’s entire income.
($2 x 2) + ($2 x 3) = $10
EC120 – Review Questions for the Final 14
Question Seven
List two points on Sam’s demand curve for bananas.
Price
Quantity of Bananas
D
Sam’s Demand Curve for Bananas
EC120 – Review Questions for the Final 15
Question Seven
Solution
Price
Quantity of Bananas
D
Sam’s Demand Curve for Bananas
2 4
$2
$1
EC120 – Review Questions for the Final 16
Question Eight
If the total product of four workers is 156, calculate the average product of each worker.a) 39b) 19.5c) 78d) 152e) 624
EC120 – Review Questions for the Final 17
Question Eight
Solution
AP = TP/L = 156/4 = 39
EC120 – Review Questions for the Final 18
Use the following table to answer Questions Nine and Ten:
Firm BLow Price
High Price
Firm A Low Price
A: $2B: $5
A: $20B: -$15
High Price
A: - $10B: $25
A: $10B: $20
Question Nine
In equilibrium what are firm A’s profits?a) -$10b) $2c) $10d) $20
Question Ten
If both firms agree to collude, what would be firm A’sprofits?a) -$10b) $2c) $10d) $20
EC120 – Review Questions for the Final 19
Question Nine
Solution
In equilibrium what are firm A’s profits?
A must decide what to do:If B chooses low A gets $2 for low A gets -$10 for highTherefore A should choose low
If B chooses high A gets $20 for lowA gets $10 for highTherefore A should choose low
b) In equilibrium – A’s profits are $2
Question Ten
Solution
If both firms agree to collude, what would be firm A’s profits?
a) -$10b) $2c) $10d) $20
EC120 – Review Questions for the Final 20
Use the following diagram to answer Question Eleven:The diagram is of a monopolistically-competitive firm in short-run equilibrium.
(Display Graph)
Question Eleven
What is the firm’s profit maximizing level of output?
a) Q1
b) Q2
c) Q3
d) Q4
EC120 – Review Questions for the Final 21
document.doc 22
Question Eleven
Solution
What is the firm’s profit maximizing level of output?
a) Q1
b) Q2
c) Q3
d) Q4
document.doc 23
Question Twelve
Under monopolistic competition, long-run economic profits tend towards zero because of:
a) Product differentiation
b) The lack of barriers to entry
c) Excess capacity
d) Inefficiency
document.doc 24
Question Twelve
Solution
Under monopolistic competition, long-run economic
profits tend towards zero because of:
a) Product differentiation
b) The lack of barriers to entry
c) Excess capacity
d) Inefficiency
document.doc 25
Use the following diagram to answer Question Thirteen:
document.doc 26
Question Thirteen
How much profit does the profit-maximizing monopoly earn?
a) $960
b) $0
c) $5040
d) $6000
e) $10
document.doc 27
Question Thirteen
Solution How much profit does the profit-maximizing monopoly earn?
a) $960
b) $0
c) $5040
d) $6000
e) $10
document.doc 28
Question Fourteen
Regardless of the type of market in which it operates, a firm should continue to operate in the short run as long as it can pay:
a) All of its fixed costs
b) The marginal costs of the last unit produced
c) All of its variable costs
d) All of its total costs
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Question Fourteen
Solution
Regardless of the type of market in which it operates, a firm should continue to operate in the short run as long as it can pay:
a) All of its fixed costs
b) The marginal costs of the last unit produced
c) All of its variable costs
d) All of its total costs
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