Firms are interdependent which means they monitor each others prices and decisions.
High barriers to entry stop ANY new firms entering the market
One supplier in market
Prices are rigidly high as firms do not compete on price
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.
There is an element of choice in this market although products are very similar
Few firms dominate the market
Firms in this market collude on prices and output to boost everyone's profits.
Unique product with higher price