The differences in two market structures are given below
- While pure competition sells identical good, pure monopoly
sells unique product
 
- There are very large number of sellers in pure competition but
only one seller in pure monopoly
 
- Firm faces flat demand curve in pure competition while firm
faces downward sloping demand function under pure monopoly
 
- There is free entry and exit in pure competition in long run
while there are entry barriers in pure monopoly
 
- Due to free entry and exit, pure competition has no economic
profit / loss in the long run. Pure monopoly can sustain profits in
long run by blocking entry
 
- Firms are price takers in pure competition while firms are
price maker when they are a pure monopoly.
 
Graphically, several other differences are shown below
