Markstrukturen

Marktstrukturen describe the organizational and competitive characteristics of a market, focusing on how many firms operate, how large they are relative to the market, how similar their products are, how easy it is to enter or exit, and how much price control firms have. These factors influence pricing, output, innovation, and welfare outcomes.

The main types are: perfect competition, monopolistic competition, oligopoly, and monopoly. In perfect competition, many buyers and sellers trade a homogeneous product with free entry and exit, and firms are price takers. Monopolistic competition features many firms offering differentiated products, giving some price power but with relatively free entry in the long run. Oligopoly involves a few large firms whose decisions are interdependent, often with significant barriers to entry and the potential for strategic behavior. Monopoly exists when a single firm provides a unique product, facing high barriers to entry and substantial price-setting power.

Market structure affects efficiency and welfare. Perfect competition is associated with allocative and productive efficiency, while monopoly can lead to higher prices and reduced output. Concentration, product differentiation, and information asymmetry help distinguish structures and are commonly measured using indicators such as concentration ratios and the Herfindahl–Hirschman Index.

Regulation and competition policy, including antitrust action and price regulation, can alter market structures by promoting entry, reducing barriers, and encouraging competition.