How can the government of a nation invest in physical capital

By building highways, railways, and airports.

Explanation:

Physical capital is one of the three main factors of production according to economic theory. Physical capital refers to tangible, concrete, man-made goods that are used in the process of creating goods and services. Therefore, this can include items such as machinery, buildings, offices, vehicles, etc. One of the ways in which the government of a nation can invest in physical capital is by building highways, railways and airports, as these are physical goods that allow us to create other goods and services.

how do you know that

explanation:

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.