Which form of market structure is characterised by interdependence in decision-making as between the different competing firms?

Oligopoly form of market structure is characterised by interdependence in decision-making as between the different competing firms. An oligopoly is a market form wherein a market or industry is dominated by a small number of large sellers (oligopolists). Oligopolies can result from various forms of collusion which reduce competition and lead to higher prices for consumers. Oligopolies have their own market structure.