Second, in terms of market monopoly of economics

Must satisfy the three conditions to achieve a monopoly market 

1. The presence of a single product of the commodity-producing 
2. The absence of other industries producing alternative goods of a commodity can be produced by the monopolist, so cross elasticity of demand for a commodity monopolist for the other commodities is equal to zero 
3. The presence of strong inhibitors prevent the entry of new competitors to the market 

Note :Project is a monopolist sets its price based on estimates of quantities which are expected to sell at different price levels and expected sales function similar in shape with the market demand curve By Economics