How are oligarchy and monarchy different in terms of their structures and distribution of power?

Oligarchy and monarchy are different in terms of their structures and distribution of power. In an oligarchy, power is held by a small group of people, often based on wealth or social status. In contrast, a monarchy is ruled by a single individual, usually a king or queen, who holds the ultimate authority. Monarchies are typically hereditary, passing power down through generations, while oligarchies may have more fluid leadership based on the group's dynamics.