Immigration 1. In the 21st century US immigrants are primarily from a. poor European countries b. middle income European countries c. poor Asian and Latin American countries d. middle income Asian and Latin American countries

2. In a dynamic model that includes physical capital formation, immigration the capital-labor ratio in the short-run and the capital-labor ratio in the long-run. a. decreases, decreases b. decreases, has no effect on c. has no effect on, decreases d. has no effect on, has no effect on

3. To discuss wage inequality, we introduced a new production function where unskilled labor and high-skilled workers are and unskilled workers and physical capital are . a. substitutes, substitutes b. substitutes, complements c. complements, substitutes d. complements, complements

4. Using the production function where unskilled labor and high-skilled workers are complements, an increase in which of the following would lower the wages of unskilled workers? a. the share of unskilled workers in a firm's total employment b. the physical capital-labor ratio c. the productivity of physical capital d. all of the above