a. technological progress
b. foreign trade
c. population growth
d. savings and investment

Personally I think it is either Population growth or Technological Progress. Which one?

Also, Which of the following statements is true, as market economies have evolved since Adam Smith’s time?

a. Government intervention in the economy has decreased.
b. Government intervention in the economy has become greater.
c. Government intervention in the economy is based on job safety.
d. Government intervention in the economy has stayed relatively the same.

Thanks for your help!