1) The document discusses different types of market structures including perfect competition, monopolistic competition, oligopolies, and monopolies. 2) Perfect competition is characterized by many small sellers, identical products, perfect consumer information and easy entry/exit. Monopolistic competition involves differentiated products and non-price competition. 3) Oligopolies are markets with a few large sellers offering similar products, while monopolies involve a single seller with no close substitutes and high barriers to entry.

1. Chapter 6: Market Structures