Two examples of modern day oligopolies?

Which statement best explains how the invention of corporations contributed to the economy in the 1800's

Which statement best explains the role of government according to thomas hobbes

Which statement best describes standard oil in the late 1800s? standard oil controlled only a small number of the nation’s oil refineries. standard oil was a single business that operated in a small region. standard oil controlled only the means and methods of oil production. standard oil owned ninety percent of all oil refineries in the united states.