Refer to the information provided in Figure 7.8 below to answer the question(s) that follow. 
Figure 7.8Refer to Figure 7.8. The slope of isocost AB is
A. -1.
B. 0.
C. 1.
D. indeterminate from this information, as the prices of capital and labor are not given.
Answer: A
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The per capita real GDP is the
A) rate of growth in real GDP plus the population growth rate. B) real GDP divided by the population. C) rate of growth in real GDP times the population growth rate. D) rate of growth in real GDP minus the population growth rate.
A profit-maximizing firm should hire an input as long as the
A. marginal revenue product of the input is at least as much as the cost of hiring the input. B. marginal revenue product of the input is greater than the marginal revenue product of other inputs the firm is using. C. price of the input doesn't exceed the price of the other inputs used in the firm's production. D. firm can increase its total revenue.
Refer to the information provided in Figure 4.4 below to answer the question(s) that follow.
Figure 4.4Refer to Figure 4.4. At the world price of ________ per barrel of oil, the United States imports 6 million barrels of oil per day.
A. $100 B. $125 C. $150 D. >$150
In the diagram, the optimal amount of R&D is:
A. $20 million.
B. $80 million.
C. $40 million.
D. $60 million.