How was Rockefeller able to build his monopoly across the oil industry? He found newer and cheaper ways to refine oil, increasing his profits.
He confined his business to Ohio so he could buy all the refineries there.
He bought up oil refineries, cut costs, and reinvested his profits in other refineries.
He began to sell kerosene as well as oil, expanding his market.

Marcel is nearing graduation. he just met with his counselor and she showed him this information. marcel's college costs & payment options per year costs methods of payment tuition & fees grants & scholarships $12,500 $6,500 room & board work-study $8,200 $9,800 if he pays the balance with a student loan, how much will he need to borrow for his first year? $4,400 $6,000 $10,900 $14,200