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Sample Questions for ECN 302 Midterm 1
The correct answers are highlighted in yellow and the explanations for selected questions are provided in bold italics.
Question (1): Which of the following will NOT cause a shift to the right in the demand curve for beer? a. A change in the price of beer. (Notes: A change in the price of beer would induce a movement along the demand curve for beer, rather than a shift in the demand curve for beer.) b. A health study indicating positive health benefits of moderate beer consumption. c. An increase in the price of French wine (a substitute). d. A decrease in the price of potato chips (a complement).
Scenario 1:
The demand for books is: QD = 120 - P The supply of books is: QS = 5P
Question (2): Refer to Scenario 1. What is the equilibrium price of books?
a. 5 b. 10 c. 15 d. 20 (Notes: To find this, set QD=QS (i.e. 120-P=5P). Thus, 6P= and P=20)
Question (3): Refer to Scenario 1. What is the equilibrium quantity of books sold? a. 25 b. 50 c. 75 d. 100 (Notes: To find this, substitute P=20 into QD or QS)
Question (4): Suppose there is a decrease in both the demand for and supply of a good. What happens to equilibrium price and quantity?
a. Equilibrium quantity increases, but the effect on equilibrium price is ambiguous b. Equilibrium quantity decreases, but the effect on equilibrium price is ambiguous (Notes: Both the demand curve and the supply curve shift to the left in this case. The new market equilibrium is given by the intersection of the new demand curve and the new supply curve. While the quantity is unambiguously lower at the new market equilibrium since there is downwards pressure on the quantity on both sides of the market, the net effect on price depends on the relative magnitudes of the shifts since the decrease in demand exerts downwards pressure on the price while the decrease in supply exerts upwards pressure on the price.) c. Equilibrium price increases, but the effect on equilibrium quantity is ambiguous b. Equilibrium price decreases, but the effect on equilibrium quantity is ambiguous.
Question (5): According to basic supply and demand analysis, when Hurricane Katrina caused oil prices to rise, what happened to the equilibrium price and quantity of sport utility vehicles? a. Equilibrium price and quantity both increased b. Equilibrium price and quantity both decreased (Notes: Gasoline and sport utility vehicles are complements. Thus, when the price of oil (and gasoline) increases, the demand for sport utility vehicles decreases (i.e. the demand curve for sport utility vehicles shifts to the left). Thus, the equilibrium price and quantity for sport utility vehicles will decrease.) c. Equilibrium price increased and equilibrium quantity decreased d. Equilibrium price decreased and equilibrium quantity increased
Question (8): Table 1
According to Table 1, which presents hypothetical data on price elasticity of demand, which of the following is true about lamb?
a. Each 2.7% change in the price of lamb causes a 1% change in the quantity demanded of lamb b. The demand for lamb is inelastic c. Each 1% change in the price of lamb causes a 2.7% change in the quantity demanded of lamb
(Notes: Since 2. 7 %
P
Q
E (^) PD D , a 1% increase in the price of
lamb causes a 2.7% decrease in the quantity demanded of lamb.) d. Lamb is a normal good
Question (9): When the government controls the price of a product, causing the price to be above the free market equilibrium price, a. all producers are made better off. b. both producers and consumers are made better off. c. all consumers are made better off. d. some, but not all, sellers can find buyers for their goods. (Notes: The government is instituting a binding price floor in this question. The quantity supplied will be greater than the quantity demanded when the price is above the equilibrium price.)
Good Price Elasticity of Demand
Car repair -1.
Bread -.
Lamb -2.
Question (10): The price elasticity of supply for gasoline in the U.S. is 0.4. If the price of gasoline rises by 8%, what is the expected change in the quantity of gasoline supplied in the U.S.? a. +3.2%
(Notes: % (% ) %
s
S s P
S s P Q E P P
Q
E ⇒ ∆ = • ∆
=. Thus, if EP S = 0. 4 and
% ∆ Ps = 8 % , % ∆ Qs = EPS • (%∆ Ps )=( 0. 4 )( 8 %)=+ 3. 2 % .) b. -3.2% c. +32.0% d. +0.32%
Question (11): Consider a supply curve of the form: Q = c + dP. If d=0, then supply is: a. completely inelastic. (Notes: The price elasticity of supply is (P/QS)( ∆ QS/ ∆ P). Since d= ∆ QS/ ∆ P=0, the price elasticity of supply is zero and supply is completely inelastic. This means that the supply curve is a straight vertical line.) b. inelastic, but not completely inelastic. c. elastic, but not infinitely elastic. d. infinitely elastic
Question (12): When government intervenes in a competitive market by imposing an effective price ceiling, we would expect the quantity supplied to _____________ and the quantity demanded to ____________. a. fall; rise (Notes: The fact that the price ceiling is effective implies that the government is forcing the maximum price to be lower than the equilibrium price. Thus, we would expect the quantity supplied to fall (since the supply curve is upwards sloping) and we would expect the quantity demanded to rise (since the demand curve is downwards sloping).) b. fall; fall c. rise; rise d. rise; fall
Question (15): An upward sloping indifference curve defined over two goods violates which of the following assumptions from the theory of consumer behavior? a. transitivity. b. preferences are complete. c. more is preferred to less. d. all of the above.
Question (16): Alvin's indifference map for Good A and Good B are shown in the diagram below.
Which of the following statements about Alvin’s preferences is correct? a. Alvin receives no satisfaction from consuming Good A. b. Alvin receives no satisfaction from consuming Good B. (Notes: Since Alvin’s indifference curves are vertical straight lines, his utility will increase if and only if the quantity of Good A increases. He receives no satisfaction from consuming Good B.) c. Alvin will only consume A and B in fixed proportions. d. None of the above.
Good A
Good B
Question (17): If Jill's MRS of popcorn for candy is 2 (popcorn is on the horizontal axis, candy is on the vertical axis), Jill would willingly give up: a. 2, but no more than 2, units of popcorn for an additional unit of candy. b. 2, but no more than 2, units of candy for an additional unit of popcorn. (Notes: The MRS measures the maximum amount of candy that Jill will give up for an additional unit of popcorn in this case since popcorn is on the X-axis and candy is on the Y- axis.) c. 1, but no more than 1, unit of candy for an additional 2 units of popcorn. d. 2, but no more than 2, units of popcorn for an additional 2 units of candy.
Question (20): When Joe maximizes utility, he finds that his MRS is greater than Px/Py. It is most likely that: a. Joe's preferences are incomplete. b. Joe's preferences are irrational. c. Joe is not consuming good X. d. Joe is not consuming good Y.
(Notes: This is very similar to the ice cream/ frozen yogurt example that we went though in class. Because the question tells us that Joe is maximizing utility at this bundle, we know that MRS> Px/Py indicates a corner solution for Joe’s utility maximizing bundle where Joe is not consuming good Y.)
Question (21): Denise is shopping for lobsters and eclairs. When she faces budget line b 1 , she chooses market basket A over market basket B. When she faces budget line b 2 , she chooses basket B over basket C. Which assumption of consumer theory helps us determine Denise’s preference ordering over basket A and basket C? a. completeness b. more is better than less c. transitivity d. convexity
Question (22): Suppose a consumer's MRS is given by the formula MRSP for T = T/P, where P stands for the number of pieces of pizza and T stands for the number of tacos. Starting at 12 tacos and 4 pizzas, the consumer must receive
a. 3 tacos to compensate them for the loss of one piece of pizza
(Notes: Since 3 4
P
T
MRSPforT and also (^)
P
T
MRSPforT , we
know that the consumer must receive 3 tacos to compensate them for the loss of one piece of pizza.) b. 3 pieces of pizza to compensate them for the loss of one taco c. 1/3 taco to compensate them for the loss of one piece of pizza d. 1/3 piece of pizza to compensate them for the loss of one taco
Question (23): To maximize his utility (U) a consumer has to choose how many cups of tea (T) and how many cups of coffee (C) to buy. The consumer’s utility function is given by U=T+C, which means that MRST for C=1 at all points on all of the consumer’s indifference curves. If the price of a cup of tea is $3 and the price of a cup of coffee is $2 and the consumer has $60 to allocate between tea and coffee, then he will buy a. 20 cups of tea and 30 cups of coffee b. 0 cups of tea and 30 cups of coffee (Notes: Since MRST for C=1 at all points on an indifference curve for this consumer, tea and coffee are perfect substitutes for this consumer and the indifference curves are downwards sloping straight lines with slopes of -1. Since PT/PC=3/2 and MRST for C=1, we know that the utility maximizing market basket is represented by a corner solution where the consumer consumes only the cheaper substitute (i.e. coffee). The consumer will optimally choose to spend all of his budget on coffee and buy 60/2=30 cups of coffee.) c. 20 cups of tea and 0 cups of coffee d. None of the above
