1. In the mythical nation of Oz, gasoline used to sell for $1 a gallon, and the natives purchased100,000 gallons a week. Four years ago, the price rose to $3 a gallon, and the natives reducedtheir quantity demanded to 90,000 gallons a week. Calculate the price elasticity for this change.Today, gas again sells for $1 a gallon in Oz, but the natives are only buying 70,000 gallons aweek. What gives?

2. A question on an economics exam asks: What happens in the market for margarine whenincome rises? Allison, an excellent student, shows the demand for margarine decreasing. Is shenecessarily wrong? Why or why not?

3. Suppose you are planning to open a lemonade stand. List separately all the explicit andimplicit costs that might be involved.

4. John is a well-known consultant who makes $150 an hour and has all the work he can handle.He has a big job in Washington DC, ten hours away. He can drive at a cost of $80 round trip ortake a one-hour flight for $300. Which is he likely to do? Are there circumstances that may leadhim to choose otherwise? (20 points)

5. The boss observes that her 10 workers produce 1,000 widgets a day. She concludes that shecan employ 20 workers and make 2,000 widgets; 30 to make 3,000; or 40 to make 4,000. Explainwhy this observation is either correct or incorrect. (20 points)

6. Andy wants to maximize his grade-point average. Having spent six hours studying for his finalexam in economics, Andy calculates his grade and discovers that even with a perfect score on thefinal, he will not pass the course. He decides to study two more hours so he will not have wastedthe first six hours. Is this a good decision? Why or why not?

7. The AB Manufacturing Company has hired an economist to evaluate its financial situation.She explains to the board of directors that the company is making zero economic profit. Shouldthe company go out of business?

8. Tom, a math major, examines Jane’s economics class notes and observes that when pricetaking firms earn economic profit, they do not seem to produce a quantity that minimizes theircosts. Is he correct? Is there significance to this observation?

9. If a technological advance lowers a firm’s production costs, why do prices typically fall?Shouldn’t the firm maintain the same price and earn economic profit?

10. If the demand for pizza falls, pizza suppliers will suffer economic losses, and some firms will15leave the industry. Why is this considered good? Shouldn’t we feel sorry for these businessowners?