Unions can restrict the supply of labor in two ways. First, they can seek to slow the growth of the labor force; unions from the earliest times have aggressively opposed immigration. Union support for Social Security also cut the labor supply by encouraging workers to retire early. Second, unions can promote policies that make it difficult for workers to enter a particular craft. Unions representing plumbers and electrical workers, for example, have restricted the number of people who can enter these crafts in some areas by requiring that workers belong to a union and then limiting the union’s membership.
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