One supplier in market
Firms are interdependent which means they monitor each others prices and decisions.
This market structure has the biggest economies of scale, especially a natural monopoly.
This firm because of its domestic dominance can compete internationally with other large firms.
Unique product with higher price
There is an element of choice in this market although products are very similar
Firms in this market collude on prices and output to boost everyone's profits.
Few firms dominate the market
Prices are rigidly high as firms do not compete on price
High barriers to entry stop ANY new firms entering the market