Use the following diagrams to answer a€“c:

a. If unions are unable to have any effect on wages, draw the supply curve for the nonunion market.
b. If unions become able to restrict the supply of labor in the union sector, indicate what would happen in both the union and nonunion sectors.
c. What happens to the union wage and the number of union workers hired in b? What happens to the nonunion wage and the number of nonunion workers hired inb?

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So D.