A market situation where a small number of sellers compose the entire industry is called

The correct answer is: oligopoly.

Explanation:

A market structure where there are only a few firms is called an oligopoly market. These firms can be producing either identical products or differentiated products.

Because of few firms, there is a high degree of competition in the market. The firms are price makers and face a downward sloping curve.

There is interdependence in the market such that the economic decisions of a firm affects the price, profits and output level of its rivals. So the firms have to consider the reaction of its rivals before making an economic decision.