A characteristic found only in oligopolies is?

A characteristic found only in oligopolies is interdependence among firms. In an oligopoly, a few large firms dominate the market, leading them to closely monitor each other's pricing and output decisions. This interdependence often results in strategic behavior, such as collusion or price wars, as firms seek to maintain their market position while responding to competitors' actions. Consequently, the actions of one firm can significantly impact the entire market.