The key characteristic of an oligopolistic market is product

The key characteristic of an oligopolistic market is: production of a homogeneous product. mutual interdependence among firms in the market. the absence of market power by any one firm. ease of entry into, and exit out of, the market.

Solution

Answer is mutual interdependence among firms in the market.

Explanation:

The interdependence of rims is a major feature of oligopoly in the sense that market share of total firms in the industry is same. If by decreasing the price, one firm tries acquire the market share, it will result in loss of share by another firm. In order to retain its market share, the other firm also has to lower its prices.