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How did John D. Rockefeller and Andrew Carnegie build fortunes in the oil and steel industries? Be specific. You should discuss horizontal and vertical integration in your answer.

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Percibeth365

Answer:

They built fortunes in the oil and steel industries since many people used oil lamps adding iron backing help them last longer.

Explanation:

They built fortunes in the oil and steel industries since many people used oil lamps adding iron backing help them last longer.

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