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    Calculating HHI in an Unconcentrated Market

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    You are the manager in a market composed of 12 firms, each of which has a 8.33 percent market share. In addition, each firm has a strong financial position and is located within a 100-mile radius of its competitors.

    Instruction: Round to the nearest penny (two decimal places).

    Calculate the premerger Herfindahl-Hirschman index (HHI) for this market.

    b. Suppose that any two of these firms merge. What is the postmerger HHI?

    c. Based only on the information contained in this question and on the U.S. Department of Justice Horizontal Merger Guidelines described in this chapter, do you think the Justice Department would attempt to block a merger between any two of the firms?

    a. It likely will not.
    b. It may but will also consider other factors.
    c. It likely will.

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    Solution Preview

    a. HHI = 12 * 8.33^2 = 832.66

    b. If two firms merge, you will have 10 firms with a 8.33 market share and 1 firm with a 16.66 market share
    HHI = 10* 8.33^2 + 16.66^2 = 971.44

    According to the DOJ-FTC 2010 ...

    Solution Summary

    The solution answers the question on how to calculate the HHI and evaluates a situation where the market is "unconcentrated". Clear formulas and step by step guidance is provided as well.