Which among the following is considered to be the best measure of an increase in a country's economic efficiency?

Increase in net annual investment.

Increase in annual private investment.

Increase in real national income.

Increase in real per capita income.

Which among the following is considered to be the best measure of an i

1.	Which among the following is considered to be the best measure of an increase in a country's economic efficiency?
A.	Increase in annual private investment.
B.	Increase in real national income.
C.	Increase in real per capita income.
D.	Increase in net annual investment.
Answer» D. Increase in net annual investment.