9.Explain the relationship between changes in opportunity costs and changes in behavior.
13.Economists say that individuals make decisions at the margin. What does this mean?
20.What is the difference between positive economics and normative economics? between microeconomics and macroeconomics?
II. Chapter 1 Appendix A: Questions & Problems: 1 (p30) 1.What type of relationship would you expect between the following: (a) salesof hot dogs and sales of hot dog buns, (b) the price of winter coats and sales of winter coats, (c) the price of personal computers and the production of personal computers, (d) sales of toothbrushes and sales of cat food, (e) number of children in a family and the number of toys in a family.