According to the "Rule of 70," how many years will it take for real GDP per capita to double when the growth rate of real GDP per capita is 5%?

Diminishing returns occurs because

A) consumers don't buy enough of the products produced. B) one of the inputs in the production process is fixed. C) not enough people have jobs. D) two people have not satisfied their self-interests.

Which of the following are important for countries to promote with property rights and incentives if economic growth is to occur?

i. specialization ii. saving and investment iii. increases in human capital iv. discovery of new technology A) iii and iv. B) ii and iii. C) ii and iv. D) i, ii, iii and iv. E) i, ii and iv only.