Chris has a one-hour break between classes every Wednesday. Chris can either stay at the library and study or go to the gym and work out. The decision Chris must make is（）
A. not an economic problem because it’s an hour that Chris has no matter what he does
B. an economic problem because the tuition Chris pays covers the cost of both the gym and the library
C. an economic problem because Chris has only one hour, and engaging in one activity means giving up the other
D. not an economic problem because neither activity costs money
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A study of the impact of various government policies on economic growth would be considered（）
A. government economics
B. marginal economics
C. macroeconomics
D. microeconomics
Which branch of economics is most likely to study differences in countries’ growth rates（）
A. microeconomics
B. macroeconomics
C. experimental economics
D. normative economics
By convention, there are two major divisions of economics, called（）
A. reservation price and opportunity cost
B. rational economics and irrational economics
C. microeconomics and macroeconomics
D. marginal benefit and marginal cost
The extra cost that results from carrying out one additional unit of an activity is the__ of the activity（）
A. opportunity cost
B. reservation cost
C. marginal cost
D. marginal benefit
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