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Correlation

Inverse Correlation Between US Union Density and Earnings Inequality (1950s-2018)

In the United States, a significant long-term inverse correlation has been observed between the rate of union membership (union density) and the level of earnings inequality. Union density peaked in the 1950s at nearly 35%, a time when inequality was at a low point. Since then, union membership has steadily declined, with the fall being particularly rapid between 1983 and 2018, when the rate dropped from 20.1% to 10.5%. This period of declining unionization has been marked by a consistent rise in earnings inequality.

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Updated 2025-10-04

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