Suppose a social activist collecting information on the level of air pollutants in sparsely populated regions concludes that pollution levels are positively related to population. Since her sample set is restricted only to sparsely populated regions her outcome would be erroneous due to:

Countries with more than 80 percent of their population living within 100 kilometers of a coast will have an average GDP per person that is

a. around four times a country with less than 20 percent of the population living near the coast. b. around ten times a country with less than 20 percent of the population living near the coast. c. around twenty times a country with less than 20 percent of the population living near the coast. d. around fifty times a country with less than 20 percent of the population living near the coast.

Which of the following is true under monopoly?

A. P > minimum of ATC. B. Profits are always positive. C. P = MR. D. None of the answers is correct.