Consider the following statement: 1. Increase in annual private investment. 2. Increase in real national income. 3. Increase in real per capita income. 4. Increase in net annual investment. Which among the following is considered to be the best measure of an increase in a country's economic efficiency?

Consider the following statement: 1. Increase in annual private inves

1.	Consider the following statement: 1. Increase in annual private investment. 2. Increase in real national income. 3. Increase in real per capita income. 4. Increase in net annual investment. Which among the following is considered to be the best measure of an increase in a country's economic efficiency?
A.	1 only
B.	2 only
C.	3 only
D.	4 only
Answer» D. 4 only