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In page Standard Oil:

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The company grew by increasing sales and through acquisitions. After purchasing competing firms, Rockefeller shut down those he believed to be inefficient and kept the others. In a seminal deal, in 1868, the Lake Shore Railroad, a part of the New York Central, gave Rockefeller's firm a going rate of one cent a gallon or forty-two cents a barrel, an effective 71% discount from its listed rates in return for a promise to ship at least 60 carloads of oil daily and to handle loading and unloading on its own.[citation needed] Smaller companies decried such deals as unfair because they were not producing enough oil to qualify for discounts.