Which of the following does the United States export?

When the rate of cyclical unemployment is zero, the:

A. natural rate of unemployment must also be zero. B. rate of frictional unemployment must be negative. C. economy must have entered a recessionary stage. D. economy is considered to be at full employment.

In the indifference curve-budget line model of labor supply, the vertical intercept of the budget line represents

a. the worker's nonlabor income. b. the wage rate paid to the worker. c. the number of leisure hours enjoyed by the worker. d. the number of hours of labor that the worker supplies.