81) Suppose that the demand curve for desktop computers shifts rightward and at the same time the supply curve shifts leftward. Which of the following could have caused these shifts?
A) Desktop computers are a normal good and incomes increased, while more firms entered the market.
B) The price of a laptop computer, a substitute for desktop computers, fell and the cost of producing desktop computers decreased.
C) Consumers purchased more computers because of the Christmas season and the labor costs of producing desktop computers decreased.
D) Desktop computers are a normal good and incomes increased, while the labor costs of producing personal computers increased.
E) Desktop computers are a normal good and incomes decreased, while the labor costs of producing personal computers increased.
82) If the demand curve for desktop computers shifts rightward and at the same time the supply curve shifts leftward, then
A) the equilibrium price definitely rises.
B) the equilibrium price definitely falls.
C) the equilibrium price definitely remains the same.
D) More information is needed to determine the effect on the equilibrium price.
E) the equilibrium quantity definitely increases.
83) If the demand curve for desktop computers shifts rightward and at the same time the supply curve shifts leftward, then
A) the equilibrium quantity definitely increases.
B) the equilibrium quantity definitely decreases.
C) the equilibrium quantity definitely remains the same.
D) More information is needed to determine the effect on the equilibrium quantity.
E) the equilibrium price definitely falls.
84) The demand for oranges increases while the supply decreases. The equilibrium price of oranges ________, and the equilibrium quantity ________.
A) rises; decreases
B) falls; perhaps changes but we can’t say if it increases, decreases, or stays the same
C) falls; increases
D) does not change; perhaps changes but we can’t say if it increases, decreases, or stays the same
E) rises; perhaps changes but we can’t say if it increases, decreases, or stays the same
85) The demand for cat food decreases while the supply increases. The equilibrium price of cat food ________, and the equilibrium quantity ________.
A) does not change; increases
B) rises; decreases
C) falls; perhaps changes but we can’t say if it increases, decreases, or stays the same
D) rises; perhaps changes but we can’t say if it increases, decreases, or stays the same
E) falls; increases
86) Suppose the government imposes a small carbon tax on automakers. But the price of gasoline has doubled due to a Middle East crisis which has reduced oil production. In the market for autos, these changes mean that supply and demand have both changed with the effect on the demand larger than the effect on the supply. The result is that the price of autos will ________ and the number of autos sold will ________.
A) rise; perhaps change but we can’t say if it increases, decreases, or stays the same
B) rise; increase
C) rise; decrease
D) fall; perhaps change but we can’t say if it increases, decreases, or stays the same
E) fall; decrease
87) If both producers and consumers believe that a product’s price will rise in the future, then at the present, demand ________ and supply ________.
A) increases; increases
B) decreases; decreases
C) increases; decreases
D) decreases; increases
E) does not change; does not change
88) If both producers and consumers believe that a product’s price will rise in the future, then at the present, the equilibrium price
A) does not change.
B) rises.
C) falls.
D) might rise, fall, or not change, but the change can never be predicted.
E) might rise, fall, or not change depending on whether the effect from the producers is greater than or less than the effect from the consumers.
89) The equilibrium price of a good occurs if the
A) quantity of the good demanded equals the quantity of the good supplied.
B) quantity of the good demanded is greater than the quantity of the good supplied.
C) quantity of the good demanded is less than the quantity of the good supplied.
D) demand for the good is equal to the supply of the good.
E) price of the good seems reasonable to most buyers.
90) If there is a surplus of a good, the quantity demanded is ________ the quantity supplied and the price will ________.
A) less than; rise
B) less than; fall
C) greater than; rise
D) greater than; fall
E) equal to; fall
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