in monopoly thre is perfect knowledge or imperfect nd y?
In monopoly,contrary to perfect competition market structure, the monopolist has a specialized information which is not known to other producers and this is the reason which keeps other firms to enter into the market.So,in a way there is imperfect information in monopoly.
On consumers side, consumers know about the producer perfectly but they don't have any option besides going to him as it is a monopoly.