Four firms control the market for a particular good,resulting in an HHI of 2,800.Total industry sales are $750,and it is known that one firm has sales of $300.If each of the remaining three firms has the same sales,then we can conclude that the remaining three firms each have a market share of:

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The Herfindahl-Hirschman Index (HHI) is calculated by summing the squares of the market shares of all firms in the market. Given the HHI of 2800 and one firm with a market share of 0.4 (since $300/$750 = 0.4), the remaining three firms must each have a market share of 0.2 to satisfy the HHI equation: 0.4^2 + 3*(0.2^2) = 0.28.

Four Firms Control the Market for a Particular Good,resulting in an HHI