The average U.S. tariff was highest in the

Data on labor-force flows show that

A) in any given month, almost none of the unemployed gets jobs. B) in any given month, almost all of the unemployed gets jobs. C) the average duration of unemployment is about 2 weeks. D) the average duration of unemployment is about 2 years. E) in any given month, about one-fourth of the unemployed get jobs.

When economies of scale exist,

a. production costs per unit increase as output expands. b. production costs per unit decline as output expands. c. total production costs decrease. d. total production costs increase.