Acharacteristic found only in oligopolies is products that are slightly different. interdependence of firms. break even level of profits. independence of firms.

The correct answer is the interdependence of firms.  

Explanation:

An oligopoly market is a market structure where there are a few firms. these firms are interdependent. Price and output decisions of a firm affect its rivals. An oligopoly firm faces a downward-sloping demand curve.  

In other market structures like monopolistic or perfect competition, the firms are not interdependent.

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answerindustrial revolution;