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The Herfindahl-Hirschman index and occupational concentration by industry : The Economics Daily : U.S. Bureau of Labor Statistics
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Additional literature
Herfindahl-Hirschman Index (HHI): Measuring Market Concentration - YouTube
GitHub - andrewwowens/hhi_analysis: Herfindahl-Hirschman Index - HHI calculator and analysis scripts for time series data
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