What was the effect of Rockefeller's affiliation with the south improvement company in 1872?

Rockefeller's affiliation with the South Improvement Company in 1872 allowed him to consolidate control over the oil industry by securing favorable railroad shipping rates, which significantly reduced transportation costs for his Standard Oil Company. This strategic partnership enabled Rockefeller to undercut competitors and gain a dominant market position in oil refining. However, it also sparked public outrage and led to investigations, ultimately contributing to increased scrutiny and regulatory reforms in the oil industry. The controversy surrounding the company highlighted issues of monopolistic practices and corporate power in America.