Firms that had virtual monopolies,that is control over at least 80 percent of industry production,because of control over an essential resource include all of the following except

Question

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While Ford Motor Company was a dominant force in the automobile industry, it did not have control over an essential resource that gave it a virtual monopoly. The other three choices (DeBeers Diamond Company, International Nickel Company, and Standard Oil Company) all had such control, making them virtual monopolies.

Firms That Had Virtual Monopolies,that Is Control Over at Least