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起止时间:2021-03-01到2021-12-31
更新状态:每5天更新一次
第一讲 像经济学家一样思考 课后测验1-3
1、 Economics is best defined as the study of:
A:how people make choices in the face of scarcity and the implications of those choices for society as a whole.
B:inflation, interest rates and the stock market.
C:supply and demand.
D:the financial concerns of businesses and individuals.
答案: how people make choices in the face of scarcity and the implications of those choices for society as a whole.
2、 The Scarcity Principle applies to:
A:consumers primarily.
B:firms primarily.
C:poor people primarily.
D:everyone.
答案: everyone.
3、 Whether studying the output of the U.S. economy or how many classes a student will take, an unifying concept is that:
A:wants are unlimited and resources are scarce, so trade-offs have to be made.
B:both wants and resources are unlimited.
C:wants are limited and resources are unlimited, so trade-offs have to be made.
D:wants are limited and resources are unlimited, so trade-offs are unnecessary.
答案: wants are unlimited and resources are scarce, so trade-offs have to be made.
4、 The Scarcity Principle tells us _, and the Cost-Benefit Principle tells us _.
A:how to make good choices; that choices involve costs and benefits
B:that good choices eliminate scarcity; how to make good choices
C:how to make choices; that choices must be made
D:that choices must be made; how to make good choices
答案: that choices must be made; how to make good choices
5、 Suppose that the extra cost to Tim of a third glass of soda is zero because he’s at a restaurant that gives free refills. According to the Cost-Benefit Principle Tim should:
A:not drink a third glass of soda.
B:drink a third glass of soda if his total benefit from drinking soda is positive.
C:drink a third glass of soda.
D:drink a third glass of soda if the extra benefit of doing so is positive.
答案: 
6、 Jen spends her afternoon at the beach, paying $1 to rent a beach umbrella and $11 for food and drinks rather than spending an equal amount of money to go to a movie. Her opportunity cost of going to the beach is:
A:the $12 she spent on the umbrella, food and drinks.
B:only $0 because she would have spent $12 to go to the movie.
C:the value she places on seeing the movie plus the $12 she spent on the umbrella, food and drinks.
D:the value she places on seeing the movie.
答案: the value she places on seeing the movie.
7、 Suppose Mary is willing to pay up to $15,000 for an used Ford pick-up truck. If she buys one for $12,000, her _ would be _.
A:benefit; $12,000
B:economic surplus; $12,000
C:cost; $15,000
D:economic surplus; $3,000
答案: economic surplus; $3,000
8、 Economists believe the Cost-Benefit Principle is:
A:a simple but useful model of how people should make choices.
B:of little use to those who wish to learn how to make better decisions.
C:a comprehensive description all the factors that influence people’s choices.
D:an interesting intellectual exercise with little applicability to the real world.
答案: a simple but useful model of how people should make choices.
9、 Economists use abstract models because:
A:they are useful for describing general patterns of behavior.
B:computers have allowed economists to develop abstract models.
C:every economic situation is essentially the same, so specific details are unnecessary.
D:every economic situation is unique, so it is impossible to make generalizations.
答案: they are useful for describing general patterns of behavior.
10、 If one fails to account for implicit costs in decision making, then applying the cost-benefit rule will be flawed because:
A:the costs will be understated.
B:the benefits will be overstated.
C:the benefits will be understated.
D:the costs will be overstated.
答案: the costs will be understated.
11、 You paid $35 for a ticket (which is non-refundable) to see SPAM, a local rock band, in concert on Saturday. Assume that $35 is the most you would have been willing to pay for a ticket. Your boss called, and she is looking for someone to cover a shift on Saturday at the same time as the concert. You would have to work 4 hours and she would pay you $11/hr. The psychic cost to you of working is $2/hr. What is the opportunity cost of going to the concert?
A:$9
B:$35
C:$36
D:$1
答案: $36
12、 You paid $35 for a ticket (which is non-refundable) to see SPAM, a local rock band, in concert on Saturday. Assume that $35 is the most you would have been willing to pay for a ticket. Your boss called, and she is looking for someone to cover a shift on Saturday at the same time as the concert. You would have to work 4 hours and she would pay you $11/hr. The psychic cost to you of working is $2/hr. Your economic surplus from going to work instead of seeing SPAM on Saturday is:
A:$1
B:$36
C:$0
D:$35
答案: $1
13、 Matt has decided to purchase his textbooks for the semester. His options are to purchase the books online with next day delivery at a cost of $175, or to drive to campus tomorrow to buy the books at the university bookstore at a cost of $170. Last week he drove to campus to buy a concert ticket because they offered 25 percent off the regular price of $16. Given that driving to campus to buy the concert ticket was rational for Matt, Matt should:
A:drive to campus to buy the books because the books are cheaper at the bookstore than online.
B:not drive to campus to buy the books because the cost of gas and his time must certainly be more than the $5 he would save.
C:drive to campus to buy the books because the $5 he would save is more than he saved by driving to campus to buy the concert ticket.
D:not drive to campus to buy the books because the $5 he would save is only two percent of the cost of the books, and that is much less than the 25 percent he saved on the concert ticket.
答案: drive to campus to buy the books because the $5 he would save is more than he saved by driving to campus to buy the concert ticket.
14、 Suppose the total benefit of watching 1 baseball game is 100, the total benefit of watching 2 games is 120, and the total benefit of watching 3 games is 125. In this case, the marginal benefit of watching the 3rd game is:
A:125
B:41.67
C:375
D:5
答案: 5
15、 Your scholarship depends on your maintaining a 3.5 cumulative GPA. Your GPA for last semester was 3.6, which brought your cumulative GPA down. What must be true?
A:Last semester’s grades were higher than your overall GPA.
B:If this semester’s grades are the same as last semester’s, you might lose your scholarship.
C:If this semester’s grades are the same as last semester’s, your overall GPA will stay the same.
D:Last semester’s grades were lower than your overall GPA.
答案: Last semester’s grades were lower than your overall GPA.
16、 Refer to the table below. The average cost of 5 units of activity is:
A:$6
B:$8
C:$4
D:$10
答案: $6
17、 Tony notes that an electronics store is offering a flat $20 off all prices in the store. Tony reasons that if he wants to buy something with a price of $50, then it is a good offer, but if he wants to buy something with a price of $500, then it is not a good offer. This is an example of:
A:the proper application of the Cost-Benefit Principle.
B:inconsistent reasoning; saving $20 is saving $20.
C:rational choice because saving 40% is better than saving 4%.
D:inconsistent reasoning because prices are sunk costs.
答案: inconsistent reasoning; saving $20 is saving $20.
18、 The following table shows the relationship between the speed of a computer’s CPU and its benefits and costs. Assume that all other features of the computer are the same (that is, CPU speed is the only source of variation), and only the CPU speeds listed below are available for purchase.
The total cost of a 2.5GHz computer is:
A:$100.
B:$1,000.
C:$900.
D:$200.
答案: $1,000.
19、 The following table shows the relationship between the speed of a computer’s CPU and its benefits and costs. Assume that all other features of the computer are the same (that is, CPU speed is the only source of variation), and only the CPU speeds listed below are available for purchase.The marginal cost of upgrading from a 2.5GHz to 3.0GHz computer is:
A:$300.
B:$200.
C:$100.
D:$400.
答案: $200.
20、 You won a free ticket to see the latest Star Trek movie this Friday night (which you can costlessly resell for its face value of $15). Your favorite band is also performing on Friday and is your only alternative activity. Friday is your last chance to see either the movie or the band. Tickets to see your favorite band cost $30, and on any given day, you would be willing to pay as much as $50 for a ticket. Based on this information, what is your opportunity cost of going to see the Star Trek movie on Friday?
A:$30
B:$35
C:$50
D:$0
答案: $35
21、 The table below shows the relationship between the number of times you get your car washed each month and your total monthly benefit from car washes. Each car wash costs $15.
What is the marginal cost of the 5th car wash each month?
A:$14
B:$12
C:$4
D:$15
答案: $15
22、 A study that deals with the salaries of university professors would be considered:
A:macroeconomics
B:economic naturalism
C:real economics
D:microeconomics
答案: microeconomics
23、 The field of economics that would be most concerned with a recent fall in interest rates is:
A:macroeconomics.
B:microeconomics.
C:economic naturalism.
D:marginal economics.
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