John D. Rockefeller
John was very determined to be successful in life after dropping out of school at a young age. Since he was able to run a monopoly for a period of time he was able to rise the prices because there were no other choices. Also he was very greedy because he rised the prices so much the profit was insane.
John was the most successful person at the time based on his profit margin. After the first year of buying and selling oil he had made $450,000 which is worth $10,467,000 nowadays