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What made Standard Oil a horizontal integration monopoly?

It owned ninety percent of US oil refineries.
It controlled all aspects of oil production.
It operated all across the United States.
It formed a trust.

User BharathYes
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2 Answers

7 votes

Answer:

It owned ninety percent of US oil refineries.

Step-by-step explanation:

User Alfishe
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Answer:

It owned ninety percent of US oil refineries.

User Michael Chao
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