Suppose U.S. high schools decide to improve the training of skilled workers by requiring students to take more math classes. The following graphs show the demand and supply (D1 and S1) for math teachers and English teachers before adding math classes, with both math and English teachers earning

$30,000, and a new demand curve (D2) for math teachers after adding more math classes. Mark on graph

(a) the old and new equilibrium salary and number of math teachers.

a. The market equilibrium salary for math teachers now is .

b. Using the ideas presented in this chapter and the previous one, explain why the salary has to go up to attract new math teachers.