John D.Rockefeller used all of the following tactics to achieve success in the oil industry except

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Rockefeller achieved success by employing company spies, extorting secret rebates from railroads, gaining a near-monopoly on oil refineries, and mercilessly squeezing out his competitors. However, he did not provide inferior oil products to sell them more cheaply. In fact, Rockefeller was known for his focus on quality control and efficiency in his oil production, which helped contribute to his success.

John DRockefeller Used All of the Following Tactics to Achieve Success