Many private-sector organizations developed estimates of unemployment throughout the 1930s. This ultimately prompted the government to define the concepts of unemployment and created modern labor force statistics that have been published since the 1940s. (Bureau of Labor Statistics, September 2026)

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https://www.bls.gov/opub/mlr/2026/article/private-sector-estimates-of-unemployment-in-the-1930s-and-the-development-of-official-labor-force-statistics.htm