There are four producers in the market for rollerblades.Their market shares are: 10 percent,20 percent,30 percent,and 40 percent.The Herfindahl-Hirschman Index is:

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The Herfindahl-Hirschman Index (HHI) is calculated by squaring the market share of each firm and then summing the results: (10^2) + (20^2) + (30^2) + (40^2) = 100 + 400 + 900 + 1600 = 3000.

There Are Four Producers in the Market for Rollerblades