This is called a renewable resource.
Answer:
The correct answer is D
Explanation:
This kind of research design involves taking a set of data, information or measurements at intervals of time over a period that happened before and after an intervention of interest in two or more nonequivalent groups.
He claimed that it was a new phenomenon because the postwar economy was booming in the US, unlike the rest of the world. As he claims, while there should be scarcity, there's an economy of abundance in the US, which goes against common sense.