The various types of competition can be grouped as follows:

Pure monopoly: Only one company provides a certain product or service in an area (e.g. post office, local utility companies). It is a result of regulation, patent, license or economies of scale. Earnings are highly predictable since competition is almost nonexistent and the degree of regulation is very high.

Pure oligopoly: A few companies produce the same commodity (e.g. oil, steel). There is enough market share for every competitor. Profit margins will depend on the economic cycle and the cyclicality of industries.

Differentiated oligopoly: A few companies produce partially differentiated products (e.g. cars, computers). The differentiation occurs along lines of quality, features, styling or services. Here it is important to evaluate the different business models of the companies. Profit margins will vary across different industries and companies.

Monopolistic competition: This industry consists of many competitors able to differentiate their products and services (e.g. food, beverage).

Pure competition: Many competitors offer the same product and service (e.g. commodity market). The degree of product differentiation gives an estimate about the margin structure of an industry. Alow product differentiation is accompanied by an intense price competition which results in low profit margins.