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
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
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Pat can either drive to work, which takes half an hour and uses $1.50 worth of gas, or take the bus, which takes an hour and costs $1.00. How should Pat get to work（）
A. Pat should drive because it saves half an hour relative to taking the bus
B. Pat should drive if saving half an hour is worth $0.50 or more
C. Pat should take the bus if saving half an hour is worth $0.50 or more
D. Pat should take the bus because it costs $0.50 less than driving
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
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
A study that deals with the salaries of university professors would be considered（）
A. macroeconomics
B. economic naturalism
C. real economics
D. microeconomics
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