Monopolistic competition is a market structure characterized by many firms selling products that are similar but not identical. This structure combines elements of both perfect competition and monopoly, occupying a middle ground between these extremes. Firms in monopolistic competition differentiate their products through branding, quality, or design, giving them some degree of market power to set prices above marginal cost, unlike in perfect competition.

Key features of monopolistic competition include product differentiation. Here, each firm offers a product that, while similar to others in the market, is differentiated based on its quality, brand image, features, or customer service. Then, The market has many firms, ensuring that no single firm can control the market price. Firms can enter or leave the market with relative ease, which limits the long-term economic profits that can be earned. In the long run, new entrants continue to erode the market power of existing firms. Due to product differentiation, firms have some control over their pricing but within the bounds set by the competition.

In monopolistic competition, consumers benefit from various choices due to product differentiation, while firms engage in non-price competition (e.g., advertising, service quality) to attract customers.

Understanding monopolistic competition is crucial for analyzing many real-world markets, especially in retail and service industries. It helps explain why similar products can coexist at different price points and why firms invest heavily in branding and product differentiation.