經濟學原理第三次作業
授課教授：莊惠玲
注意：請把選擇題答案寫在下面格子裡，問答題寫在背面空白處務必標清楚題號
一、問答題：
課本第四章第 99 頁 PROBLEMS 第 4 題 第 12 題 第 16 題
課本第五章第 119 頁 PROBLEMS 第 2 題
二、選擇題：
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15.
1. The price elasticity of demand depends on
A)
the units used to measure price and the units used to measure quantity.
B)
the units used to measure price but not the units used to measure quantity.
C)
the units used to measure quantity but not the units used to measure price.
D)
neither the units used to measure price nor the units used to measure quantity.
2. A shift of the supply curve of oil raises the price of oil from $9.50 a barrel to $10.50 a barrel and
reduces the quantity demanded from 41 million to 39 million barrels a day. The price elasticity of
demand for oil is
A)
2 million barrels a day per dollar.
B)
$1 per 2 million barrels a day.
C)
0.5.
D)
2.0.
3. Which of the following statements is FALSE?
A)
A good with a vertical demand curve has a perfectly inelastic demand.
B)
A good with a straight line, downward sloping demand curve has a demand whose elasticity is
constant.
C)
A good with a horizontal demand curve has a perfectly elastic demand.
D)
All of the above statements are false.
4. The figure above represents the behavior of total revenue as price falls along a straight-line demand
curve. What is the price elasticity of demand if total revenue is given by point f?
A)
Demand is inelastic.
B)
Demand is unit elastic.
C)
Demand is elastic.
D)
It is impossible to determine.
5. The figure above represents the behavior of total revenue as price falls along a straight-line demand
curve. Unit elasticity of demand occurs at
A)
point g.
B)
point h.
C)
point i.
D)
point j.
6. The cross elasticity of demand between apples and oranges is defined as
A)
the percentage change in the quantity of apples demanded divided by the percentage change in
the price of oranges.
B)
the price elasticity of demand for apples divided by the price elasticity of demand for oranges.
C)
the percentage change in the quantity of apples demanded divided by the percentage change in
the quantity of oranges demanded.
D)
the change in the quantity of apples demanded divided by the change in the quantity of oranges
demanded.
7. The income elasticity of demand for restaurant meals is 1.61. So,
A)
if income increases by 16.1 percent, the quantity demanded of restaurant meals will increase by
10 percent.
B)
if income increases by 10 percent, the quantity demanded of restaurant meals will increase by
16.1 percent.
C)
restaurant meals are an income elastic normal good.
D)
Both answers B and C are correct.
8.
If a 3 percent increase in the price of tennis shoes leads to a 7 percent increase in the number of
tennis shoes supplied,
A)
the elasticity of supply equals 0.43.
B)
the elasticity of supply equals 2.33.
C)
income elasticity equals 2.33.
D)
supply is inelastic.
9. The willingness to pay curve is the same as
A)
the demand curve, but not the marginal benefit curve.
B)
the demand curve and the marginal benefit curve.
C)
the marginal benefit curve, but not the demand curve.
D)
neither the marginal benefit curve nor the demand curve.
10.
Consumer surplus is
A)
the value of a good minus the price paid for it.
B)
the price paid for a good minus the value of the good.
C)
the price paid for a good minus the opportunity cost of making it.
D)
the opportunity cost of making a good minus the price paid for it.
11. When a market is in equilibrium, the total amount of consumer surplus must be ____ the total
amount of producer surplus.
A)
larger than
B)
equal to
C)
less than
D)
None of the above answers are correct.
12. In the above figure,
A)
marginal social cost equals marginal social benefit when 300,000 purses are produced.
B)
500,000 purses should be sold for $50 each for an efficient outcome.
C)
it is impossible to determine the efficient quantity of purses.
D)
None of the above answers is correct.
13. In the above figure, if the market produces the efficient amount of purses then consumer surplus
equals triangle
A)
abc.
B)
bcd.
C)
adc.
D)
cgf.
14. In the above figure, the total consumer surplus at the efficient level of output is ____.
A)
$4.5 million
B)
$9.0 million
C)
$2.5 million
D)
$8.5 million
15. The big tradeoff is a tradeoff between
A)
efficiency and fairness.
B)
consumer surplus and producer surplus.
C)
taxes and subsidies.
D)
price ceilings and price floors.