Suppose a Fiat 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 a Herfindahl-Hirschman index of 2,765. Case share of that market was 22%, while the Fiat compromised just twelve percent of the market. If approved, by how much would the merger Herfindahl-Hirschman index increase? Based only on this information do you think the Justice Department would challenge the merger?

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