The United States began to report its gross domestic product (GDP) only since

The demand for food is most elastic in countries

A) with low income levels. B) with intermediate income levels. C) with high income levels. D) that are highly urbanized.

Although economic science can contribute theoretical and factual knowledge on a particular issue, the final decision on policy questions often depends on:

a. information that is not currently available b. social values c. ethical considerations d. all of these