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10.Explain the relationship between changes in opportunity costs and changes in behavior.14.Economists say that individuals make decisions at the margin. What does this mean?21.What is the difference between positive economics and normative economics? between microeconomics and macroeconomics?II. Chapter 2: Questions & Problems: 1, 3 (p63)1.Describe how each of the following would affect the U.S. production possibilities frontier: (a) an increase in the number of illegal aliens enteringthe country; (b) a war; (c) the discovery of a new oil field; (d) a decrease in the unemployment rate; (e) a law that requires individuals to enter lines of work for which they are not suited.