A Common Feature of Monopolistic Competition,pure Monopoly,and Perfect Competition Is

Multiple Choice

A common feature of monopolistic competition,pure monopoly,and perfect competition is that _____

A) entry is free in each market structure.
B) producers in each market structure earn economic profit in the long run.
C) producers in each market structure sell differentiated products.
D) firms in these market structures act as price takers.
E) the profit-maximizing condition in each market is the same.