The Justice Department began using the Herfindahl index (rather than the four- and eight-firm concentration ratios) in 1982.

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The Justice Department started using the Herfindahl-Hirschman Index (HHI) for evaluating market concentration and potential antitrust concerns in 1982, moving away from the simpler four- and eight-firm concentration ratios to this more comprehensive measure.

The Justice Department Began Using the Herfindahl Index (Rather Than