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HHI Index

Suppose Fiat recently entered into an Agreement and Plan of Merger with Case for $4.3 billion. Prior to the merger, the market for four-wheel-drive tractors consisted of five firms. The market was highly concentrated, with Herfindahl-Hirschman index of 3,025. Case's share of that market was 27 percent, while Fiat comprised just 13 percent of the market. If approved, by how much would the postmerger Herfindahl-Hirschman index increase? Based only on this information, do you think the Justice Department would challenge the merger? Explain?

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The HHI Index will rise by:
(27+13)^2 - 27^2 - 13^2 = 702

Based on this information the ...

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