1.Descn'be how each of the following would affect the us. production possibilities frontier (PPF): (a) an increase in the number of illegal immigrants entering the country, (b) a war that takes place on US. soil, (0) the discovery of a new oil eld, (d) a decrease in the unemployment rate, (e) a law that requires individuals to enter lines of work for which they are not suited. 2. Explain how the following can be represented in a PPF framework: (a) the niteness of resources implicit in the scarcity condition; (b) choice; (c) opportunity cost; (d) productive efciency; (e) unemployed resources. 3. What condition must hold for the PPF to be bowed outward (concave downward)? To be a straight line? 4.Give an example to illustrate each of the following: (a) constant opportunity costs : (b) increasing opportunity costs: 5.Why are most production possibilities frontiers (PPFs) for goods bowed outward (concave downward)? 6. Within the PPF framework, explain each of the following: (a) a disagreement between a person who favors more domestic welfare spending and one who favors more national defense spending; (b) an increase in the population; and (c) a technological change that makes resources less specialized. 7. Explain how to derive a production possibilities frontier. For instance, how is the extreme point on the vertical axis identied? How is the extreme point on the horizontal axis identied? 8. If the slope of the production possibilities frontier is the same between anytwo points, what does this imply about costs? Explain. 9. Suppose a nation's PPF shifts inward as its population grows. What happens, on average, to the material standard of living of the people? Explain . 10.Can a technological advancement in sector \" X\" of the economy affect the numberof people who work in sector \"Y\" of the economy? Explain