The lion's share of purchases and transactions in the U.S. economy are made with coins and paper money

Considering perfect competition, monopolistic competition, and monopoly, which of the market structures features entry in the long run?

The growth of real GDP per person in the United States between 1960 and 2016 was the result of:

A. neither the growth in average labor productivity nor the share of population employed. B. growth in both average labor productivity and the share of population employed. C. growth in the share of population employed only. D. growth in average labor productivity only.