The Herfindahl index would be 5000 if there are only two firms in an industry with equal market shares.

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The Herfindahl index ranges from 0 (perfect competition) to 10,000 (monopoly), and it is calculated by summing the squares of the market shares of all firms in the industry. When there are only two firms with equal market shares, the Herfindahl index is calculated as (0.5)^2 + (0.5)^2 = 0.25 + 0.25 = 0.5, which would translate to an index of 5000 out of 10,000.

The Herfindahl Index Would Be 5000 If There Are Only