The secret of John D. Rockefeller wealthy

John D Rockefeller is a most powerful and wealthiest person since 17th Century.  He monopolized mining business with the standard oil company.  These are his wealthy  as follows  :

Rockefeller wealth secret. Founder of standard oil company.
1. His luck appear when Rockefeller's family move to cleve land, Ohio.  USA
2. Rockfeller's First business  is agriculture trading
3. His wealthy burst in refining oil
4. Rockefeller business strategy :
Drop price until 80 percent to break competition.
After Rockefeller dead, standard oil divest to two separate company.  Chevron & Exxon.