The document discusses oligopoly, which is a market structure characterized by a small number of firms having significant control over the market. It provides examples of oligopolistic industries in India such as aviation, soft drinks, steel, and petroleum. In these industries, a small group of major players dominate the market and engage in interdependent behavior such as price wars to gain market share from each other. The document also notes that oligopolistic industries are subject to strict government control and regulations.