The fact that members of labor unions often have higher wages than do workers who are not members of a union is proof that the marginal productivity theory of income distribution is not valid.

Question

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The fact that union members often have higher wages does not invalidate the marginal productivity theory of income distribution; it may reflect the bargaining power of unions to secure wages closer to the marginal productivity of their members, among other factors.

The Fact That Members of Labor Unions Often Have Higher