Which of the following identifies correct reasons for the sustained growth in the Western world post 19th century?

Why, in the U.S., do professional soccer players command a far lower salary than professional baseball players?

A) Soccer is in much less demand. B) Soccer costs less to manage and perform compared to baseball. C) Soccer has yet to mature. D) The baseball players prefer lobbied to keep soccer salaries low.

At equilibrium income:

a. planned and actual expenditure are equal. b. GDP will remained unchanged until an exogenous shock occurs. c. unplanned inventories are equal to zero. d. all of the above.