How are shared monopoly, oligopoly, and interlocking directorates defined?
A) They are unrelated concepts in economics.
B) Shared monopoly, oligopoly, and interlocking directorates refer to the same economic phenomenon.
C) Shared monopoly involves multiple companies dominating a market, oligopoly is a single dominant firm, and interlocking directorates are irrelevant to economics.
D) Shared monopoly, oligopoly, and interlocking directorates are all forms of cooperative economic models.