If you must determine the long-run equilibrium output of a perfectly competitive firm and you are permitted to see only one curve, which of the following curves is most helpful?

The natural rate of unemployment will not change following an increase in ________ unemployment

A) frictional B) cyclical C) structural D) all of the above

The combined GDP of developing countries constitutes approximately

a. 5 percent of global GDP. b. 20 percent of global GDP. c. 30 percent of global GDP. d. 40 percent of global GDP.