Great Source Co.has an 85 percent market share.Under modern antitrust law,Great Source necessarily has a monopoly.

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Having an 85% market share does not necessarily mean that a company has a monopoly. Under modern antitrust law, a company is considered to have a monopoly if it has significant market power and the ability to control prices and exclude competition. Therefore, it is possible for a company to have a high market share without being considered a monopoly.