I gonna disagree with everybody, by agreeing with everybody: Rockefeller's Standard Oil benefited consumers by providing much safer oil at a higher price; the previous race to the bottom delivered low prices - too low, only highly volatile fuel with an unpredictable mix could be produced for such low prices. But Standard Oil also harmed consumers with high prices, particularly over time, compared to government oversight; say by regulation or cerification of refinerys. So it was broken up, eventually.