How was the roman empire dependent on slavery

Besides manual labor, slaves performed many domestic services, and might be employed at highly skilled jobs and professions.  Accountants and physicians were often slaves.  Slaves of Greek origin particular might be highly educated.

Cartels, monopolies, trusts, and horizontal and vertical integration all share the goal of increasing profits. The step by the federal government to limit the power of corporations is the Sherman Antitrust Act. The argument that supports the perception of the big business leaders as "captains of industry" is that the support for technology benefits the economy.