John Cooper Market Structures
Monopoly
Ease of Entry: Very Difficult
Control Over Prices: Substantial
Number of Producers: One
Similarity of Products: Unique
Monopolistic Competition
Ease of Entry: Few barriers
Control Over Prices: Some
Number of Producers: Many
Similarity of Products: Very Different
Perfect Competition
Ease of Entry: Very Easy
Control Over Prices: None
Number of Producers: High
Similarity of Products: Identical
Market Failures
Negative Externiality
Positive Externiality
Oligopoly
Ease of Entry: Difficult
Control Over Prices: Some
Number of Producers: Few
Similarity of Products: Similar