All of the following actions promote capital deepening except
a. raising taxes to pay for building roads.
b. saving less and spending more of one's disposable income.
c. borrowing money from foreign nations to invest in building infrastructure in this country.
d. a low population growth rate at the same time that capital stock expands.

the correct answer is “opportunity cost”. opportunity cost is what a company misses out because it decided in one option over another one. in this case, the company decided to invest in building a factory so it gave up another possible benefit or profit in order to achieve success with the factory.  

trade-off is not the correct answer since it is a situation in which you accept losing something in return for benefits in other areas.

and finally, consequence is a general term used to accept what it comes when you make a decision. it can be a positive or negative consequence depending if the decision you took was the correct one.  

yup! you are correct it is b.