Research by H. Gregg Lewis shows that over the period 1929-1979,

Name: Research by H. Gregg Lewis shows that over the period 1929-1979,
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The research conducted by H. Gregg Lewis showed that the average wage of union members was 10 to 15 percent higher than that of comparable nonunion labor. This suggests that union membership was beneficial for workers in terms of increased wages. However, the research did not suggest that labor unions increased or decreased productivity.