One of the main reasons John D. Rockefeller was able to succeed in the oil industry was because he
Aencouraged competition.
Btreated his competitors fairly.
Ccombined vertical and horizontal integration.
Durged government regulation of the oil industry.
Aencouraged competition.
Btreated his competitors fairly.
Ccombined vertical and horizontal integration.
Durged government regulation of the oil industry.