More density would also narrow racial pay gaps, while a decline in density correlated to surges in wealth inequality Tripling union membership in the US would lead to a 14. 5% raise for the median US worker, shifting $1. 2tn to workers annually and significantly narrowing racial wage gaps, accord...
Source: [Guardian US](https://www.theguardian.com/us-news/2026/jul/15/union-membership-rates)