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When the Shaffers had a monthly income of $4,000, they usually ate out 8 times a month. Now that the couple makes $4,500 a month, they eat out 10 times a month. Compute the couple's income elasticity of demand using the midpoint method. Explain your answer. Is a restaurant meal a normal or inferior good to the couple?

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The income elasticity of deman...

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If the cross-price elasticity of demand for two goods is 1.25, then


A) the two goods are luxuries.
B) the two goods are substitutes.
C) one of the goods is normal and the other good is inferior.
D) the demand for one of the goods conforms to the law of demand, but the demand for the other good violates the law of demand.

E) A) and B)
F) B) and C)

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Elasticity measures how responsive quantity is to changes in price.

A) True
B) False

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Drug interdiction, which reduces the supply of drugs, may decrease drug-related crime because the demand for drugs is inelastic.

A) True
B) False

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Holding all other forces constant, if decreasing the price of a good leads to an increase in total revenue, then the demand for the good must be


A) unit elastic.
B) inelastic.
C) elastic.
D) None of the above is correct because a price increase always leads to an increase in total revenue.

E) C) and D)
F) A) and D)

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Table 5-4  Prica  Tatal  Revenup $10$100$12$108$14$112$16$112\begin{array} { | c | c } \hline \text { Prica } & \begin{array} { c } \text { Tatal } \\\text { Revenup }\end{array} \\\hline \$ 10 & \$ 100 \\\hline \$ 12 & \$ 108 \\\hline \$ 14 & \$ 112 \\\hline \$ 16 & \$ 112 \\\hline\end{array} -Refer to Table 5-4. As price rises from $10 to $12, the price elasticity of demand using the midpoint method is approximately


A) 0.08.
B) 0.18.
C) 0.42.
D) 0.58.

E) A) and D)
F) None of the above

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Figure 5-9 Figure 5-9   -Refer to Figure 5-9. Suppose this demand curve is a straight, downward-sloping line all the way from the horizontal intercept to the vertical intercept. We choose two prices, P<sub>1</sub> and P<sub>2</sub>, and the corresponding quantities demanded, Q<sub>1</sub> and Q<sub>2</sub>, for the purpose of calculating the price elasticity of demand. Also suppose P<sub>2 </sub>><sub> </sub>P<sub>1. </sub>In which of the following cases could we possibly find that (i)  demand is elastic and (ii)  an increase in price from P<sub>1</sub> to P<sub>2</sub> causes an increase in total revenue? A) 0 < P<sub>1 </sub>< P<sub>2 </sub>< $10. B) $10 < P<sub>1 </sub>< P<sub>2 </sub>< $15. C) P<sub>1 </sub>> $15. D) None of the above is correct. -Refer to Figure 5-9. Suppose this demand curve is a straight, downward-sloping line all the way from the horizontal intercept to the vertical intercept. We choose two prices, P1 and P2, and the corresponding quantities demanded, Q1 and Q2, for the purpose of calculating the price elasticity of demand. Also suppose P2 > P1. In which of the following cases could we possibly find that (i) demand is elastic and (ii) an increase in price from P1 to P2 causes an increase in total revenue?


A) 0 < P1 < P2 < $10.
B) $10 < P1 < P2 < $15.
C) P1 > $15.
D) None of the above is correct.

E) None of the above
F) All of the above

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If we observe that when the price of chocolate decreases by 10%, quantity demanded increases by 25%, then the demand for chocolate is price elastic.

A) True
B) False

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Table 5-5 Table 5-5    -Refer to Table 5-5. Along which of the supply curves does quantity supplied move proportionately more than the price? A) along supply curve B only B) along supply curves B and C C) along all three supply curves D) None. Quantity supplied moves proportionately less than the price along all of the three supply curves. -Refer to Table 5-5. Along which of the supply curves does quantity supplied move proportionately more than the price?


A) along supply curve B only
B) along supply curves B and C
C) along all three supply curves
D) None. Quantity supplied moves proportionately less than the price along all of the three supply curves.

E) A) and C)
F) All of the above

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Table 5-2  Priea  Quintit $1000$8010$6020$4030$2040$050\begin{array} { | l | l | } \hline \text { Priea } & \text { Quintit } \\\hline \$ 100 & 0 \\\hline \$ 80 & 10 \\\hline \$ 60 & 20 \\\hline \$ 40 & 30 \\\hline \$ 20 & 40 \\\hline \$ 0 & 50 \\\hline\end{array} -Refer to Table 5-2. Using the midpoint method, if the price falls from $60 to $40, the absolute value of the price elasticity of demand is


A) 0.4.
B) 1.
C) 4.
D) 20.

E) A) and C)
F) A) and D)

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Holding all other forces constant, if increasing the price of a good leads to a decrease in total revenue, then the demand for the good must be


A) unit elastic.
B) inelastic.
C) elastic.
D) None of the above is correct because a price increase always leads to an increase in total revenue.

E) None of the above
F) B) and D)

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Which of the following should be held constant when calculating an income elasticity of demand?


A) the quantity of the good demanded
B) the price of the good
C) income
D) All of the above should be held constant.

E) All of the above
F) A) and B)

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Drug interdiction, which reduces the supply of drugs, will likely be a less effective policy than educating consumers to reduce their demand for drugs because the drug interdiction policy will lower drug prices and reduce the quantity of drugs demanded.

A) True
B) False

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If the price elasticity of demand for a good is 1.5, then a 3 percent decrease in price results in a


A) 0.5 percent increase in the quantity demanded.
B) 2 percent increase in the quantity demanded.
C) 4.5 percent increase in the quantity demanded.
D) 5 percent increase in the quantity demanded.

E) A) and D)
F) A) and C)

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Suppose good X has a positive income elasticity of demand. This implies that good X could be (i) A normal good.(ii) A necessity.(iii) An inferior good.(iv) A luxury.


A) (i) only
B) (i) and (ii) only
C) (i) , (ii) , and (iv) only
D) (iii) only

E) B) and D)
F) B) and C)

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An increase in the price of cheese crackers from $2.25 to $2.45 per box causes suppliers of cheese crackers to increase their quantity supplied from 125 boxes per minute to 145 boxes per minute. Using the midpoint method, supply is


A) elastic, and the price elasticity of supply is 1.74.
B) elastic, and the price elasticity of supply is 0.57.
C) inelastic, and the price elasticity of supply is 1.74.
D) inelastic, and the price elasticity of supply is 0.57.

E) All of the above
F) C) and D)

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Figure 5-16 Figure 5-16   -Refer to Figure 5-16. Using the midpoint method, what is the price elasticity of supply between point A and point B? A) 0.58 B) 0.71 C) 1.06 D) 1.4 -Refer to Figure 5-16. Using the midpoint method, what is the price elasticity of supply between point A and point B?


A) 0.58
B) 0.71
C) 1.06
D) 1.4

E) A) and B)
F) B) and C)

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In January the price of dark chocolate candy bars was $2.00, and Willy's Chocolate Factory produced 80 pounds. In February the price of dark chocolate candy bars was $2.50, and Willy's produced 110 pounds. In March the price of dark chocolate candy bars was $3.00, and Willy's produced 140 pounds. The price elasticity of supply of Willy's dark chocolate candy bars was about


A) 0.70 when the price increased from $2.00 to $2.50 and 0.76 when the price increased from $2.50 to $3.00.
B) 0.88 when the price increased from $2.00 to $2.50 and 1.08 when the price increased from $2.50 to $3.00.
C) 1.42 when the price increased from $2.00 to $2.50 and 1.32 when the price increased from $2.50 to $3.00.
D) 1.50 when the price increased from $2.00 to $2.50 and 1.18 when the price increased from $2.50 to $3.00.

E) B) and C)
F) B) and D)

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Which of the following is likely to have the most price inelastic demand?


A) white chocolate chip with macadamia nut cookies
B) Mrs. Field's chocolate chip cookies
C) milk chocolate chip cookies
D) cookies

E) A) and C)
F) None of the above

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Figure 5-14 Figure 5-14   -Refer to Figure 5-14. Using the midpoint method, what is the price elasticity of supply between points D and G? A) 1.89 B) 1.26 C) 0.53 D) 0.34 -Refer to Figure 5-14. Using the midpoint method, what is the price elasticity of supply between points D and G?


A) 1.89
B) 1.26
C) 0.53
D) 0.34

E) None of the above
F) All of the above

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