Kelly's marginal utilities for magazines and packages of gummy bears are listed in the table above. What is the extra utility received by Kelly when she decides to consume 3 packages of gummy bears instead of 2 packages?
A) 20
B) 160
C) 180
D) 540
B
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If a firm increases production, then its:
A. fixed costs stay the same. B. total costs increase. C. variable costs rise. D. All of these are true.
If you can buy 9 DVDs for $126 or you could buy 10 DVDs for $130, then the marginal cost of the tenth DVD is
A. $4. B. $13. C. $14. D. $130.
Refer to the information provided in Figure 16.6 below to answer the question(s) that follow. 
Figure 16.6Refer to Figure 16.6. In the top portion of the figure are the demand curves of two people in this society for a public good. Which of the panels represents the market demand curve for the public good?
A. Panel A B. Panel B C. Panel C D. Panel D
The important characteristic of normative statements is that they
A) explain what really exists. B) are based on somebody's values and cannot be tested. C) explain what normally happens in the real world. D) help guide us to what will normally occur if some economic variable changes its value. E) do not use the ceteris paribus assumption.