What is a system of government in which decision-making is vested in a small group of people?

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An oligarchy is a system of government in which decision-making is vested in a small group of people. Monarchy is a form of government in which a single person, the monarch, holds all the power. Democracy is a form of government in which the power is vested in the people. Patriarchy refers to a social system in which men hold primary power and predominate in roles of political leadership.

What Is a System of Government in Which Decision-Making Is