What would be the appropriate change in the U.S. degree of plastic-waste cleanliness if the marginal cost of pollution abatement is higher than the associated marginal benefit?

During her years of college, Dominique discovered that her three favorite subjects were astronomy, chemistry, and political science. She chose to major in astronomy because she had seen data indicating that science majors earn higher-than-average wages and because she liked astronomy better than both chemistry and political science. Upon graduation, however, she learned that average wages in chemistry fields were $20$ percent higher than average wages earned by astronomers. Did Dominique's behavior violate the rationality assumption?

Under the rationality assumption, could a woman potentially take into account her family's welfare as well as her own when considering having another child? Explain your reasoning.

Calculate the slope of the function you graphed in Problem A-5.

Does the phrase “unlimited wants and limited resources” apply to both a low-income household and a middle-income household? Can the same phrase be applied to a very high-income household?

Recently, a bank was trying to decide what fee to charge for “expedited payments”—payments that the bank would transmit extra-speedily to enable customers to avoid late fees on cable TV bills, electric bills, and the like. To try to determine what fee customers were willing to pay for expedited payments, the bank conducted a survey. It was able to determine that many of the people surveyed already paid fees for expedited payment services that exceeded the maximum fees that they said they were willing to pay. How does the bank’s finding relate to economists’ traditional focus on what people do, rather than what they say they will do?