Barriers to Entry:Barriers to entry are factors that make it difficult for new firms to enter a market and compete with existing firms, such as high start-up costs, legal restrictions, or exclusive access to resources.
Perfect Competition:Perfect competition is a market structure characterized by many small firms selling homogeneous products, with no individual firm having the ability to influence market prices.
Monopolistic Competition:Monopolistic competition is a market structure where there are many firms selling similar but differentiated products, and new firms can easily enter the market.