One method that both Rockefeller and Carnegie used was vertical integration. Vertical integration is when one business in an industry makes deals or …show more content…
Horizontal integration is when one business buys out all the other businesses on the market. Horizontal integration can lead to a monopoly. Rockefeller’s problem with using horizontal integration was that Ohio state law wouldn’t allow a company to buy any stock of another company. Rockefeller got around this by creating a trust. In a trust, all the different organization assign their stock to a board of trustees. The board of trustees then combines them into a new organization. Rockefeller’s oil company, U.S. Standard Oil, bought out many other companies, including Clarke, Payne & Company. At one point, Rockefeller’s company controlled 90% of the nation’s oil supply, making it almost a