Rockefeller combined his many companies to create standard oil trust forming a monopoly (eliminate competition) on the oil market which question 7 options: allowed him to set the price for oil, but hurt the consumer who paid a higher price. led to massive riots across the us that forced rockefeller to sell the standard oil trust to the government made the price of oil drop because consumers had many options to choose from for oil did not affect him, the consumer, or the price of oil