Answered By: Rich Gause
Last Updated: Dec 12, 2014     Views: 3838

Economic Census: Concentration Ratios (1992+) "classify industries by the percent of output accounted for by the largest 4, 8, 20 and 50 companies."

The Herfindahl-Hirschman Index (HHI) is calculated for the 50 largest companies (manufacturing industries only).

More information is available on the Concentration Ratios page of the Business & Economics -- Government Resources guide.

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