Which of the factors below contributed to the collapse of the Phillips curve in the 1970s?
a. Economic research proved there was no relationship between inflation and unemployment rates.
b. The U.S. government was running triple-digit deficits in the 1970s, compounding the normal shifts in aggregate demand.
c. The 1970s were full of adverse supply shocks such as the oil price increases of 1973-1974.
d. The aggregate demand curve shifted to the left at the end of the Vietnam War.
c
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Today, in the United States, imports are about
A) 16 percent of GDP. B) 32 percent of GDP. C) 8 percent of GDP. D) 4 percent of GDP.
Suppose the figure below shows the demand curve, marginal revenue curve and marginal cost curve for a monopolist. 
At this monopolist's profit-maximizing level of output, its total revenue equals the area:
A. 0FLE. B. ELJB. C. 0HNC. D. 0FJB.