Necessarily decreasing at the equilibrium output

Necessarily increasing at the equilibrium output

Necessarily increasing at the equilibrium price

Necessarily decreasing at the equilibrium price

Duopoly

Monopoly

None-collusive oligopoly 

Collusive oligopoly

Availability of raw materials 

Profits

Profits of the output

Production of the output

SMC ,SAC and STC

LMC, SAC and AR=AC

LMC,LAC and AR=AC

LMC, LAC and AR=MR

The average cost curve of a firm

The average cost curve of a an industry

The average revenue curve of an industry 

The average revenue curve of firm

Comparatively easy entry

Standardized product

Paucity of firm

D) All of the above.

Best level of profit only

Best level of out put

Best level of rivals price

All of the above

Pure oligopolist

Pure monopolist

Pure duopolist

None of these

Short-run equilibrium under perfect competition in the industry and firm

Long-run equilibrium under imperfect competition in the industry and firm

Long-run equilibrium under perfectly competition in the both industry and firm

Long-run equilibrium under oligopolistic competition in the industry only

1 and 4

1 and 3

4 only

1, 2 and 3 only