How did John D Rockefeller take a different approach to business consolidation from the approach taken by Andrew Carnegie?

John D. Rockefeller focused on horizontal integration for business consolidation, primarily through the creation of the Standard Oil Trust, which aimed to control the oil industry by acquiring and merging with competitors. In contrast, Andrew Carnegie employed vertical integration, aiming to control every aspect of steel production, from raw materials to distribution. While Rockefeller's strategy centered on eliminating competition to establish monopolies, Carnegie's approach involved optimizing production processes and supply chains to increase efficiency and reduce costs. Both strategies were effective, but they represented fundamentally different philosophies of business growth.