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Which of the following labor union tactics would lead to both higher wages and an increased number of jobs in a perfectly-competitive labor market?
The union successfully lobbies for increased licensing requirements for people wishing to work within its industry.
The union uses collective bargaining to increase the wages paid to its members.
A plumbers' union negotiates a new collective bargaining agreement that will require employers to hire only union members.
The union successfully lobbies the federal government for legislation decreasing the number of immigrants granted worker visas.
Unions successfully lobby Congress to increase the minimum wage.