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
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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
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
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
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