Refer to the short-run information provided in Figure 8.5 below to answer the question(s) that follow. 
Figure 8.5 Refer to Figure 8.5. The marginal cost of the seventh drone is
A. $2.86.
B. $3.33.
C. $20.
D. indeterminate from this information.
Answer: C
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If we compare income percentages of total income of the highest quintile in 1968 with 2008, we would find that it was
A. rising. B. staying about the same. C. falling.
If a monopolist is producing a level of output where MR is less than MC, then it should
A. Increase its output. B. Lower its price. C. Lower its output. D. Shift its marginal cost curve upward.
Technological innovations will cause:
A. the production possibilities curve to stay the same. B. the production possibilities curve to shift to the left. C. the production possibilities curve to shift to the right. D. an economy to operate below its production possibilities curve.
Barriers to entry:
A. can result from government regulation. B. usually result in pure competition. C. exist in economic theory but not in the real world. D. are typically the result of wrongdoing on the part of a firm.