A monopoly exists where there is only one supplier of a product or service. This allows the supplier to set higher prices than when competing. There are degrees of monopoly, and only the commodity market is completely free from the monopoly power of pricing.

Monopoly usually means the absence of competition, and therefore the supplier has a very high degree of influence on pricing. In the absence of competition, the product sold must have a price cross-elasticity close to zero with any other product. As prices change, the volumes sold follow the demand curve in the market; if prices rise, buyers either pay or do without switching to another supplier.

A market that does not correspond to monopoly but also does not correspond to ideal competition is described as having monopolistic competition or imperfect competition.

Monopolies can arise in various ways, including:

Legislative monopolies in the entire market.
Patents and copyrights: they create (usually very narrow) legally fixed monopolies on certain products or services.
Natural monopolies: This includes many utility companies for which the cost of building a distribution network makes building more than one unprofitable.
Cartels: agreements between former competitors to cooperate on pricing or market share issues; illegal in most countries.
Network effects: They can both help create a monopoly and make it more difficult to eliminate it after it is established.
Market access control: For example, if a retailer can buy out all the best websites to distribute a particular product in a particular area, it can block competitors' access to customers.
It is clearly beneficial for suppliers to try to reduce competition with their own products as much as possible, this may be through differentiating their products, creating barriers to entry, and deliberately using network effects.

Most countries have antitrust laws (often called antitrust laws, especially in the United States) that control the creation and abuse of monopolies, as well as regulatory authorities authorized to enforce these laws. It has been quite successful in curbing some types of abuses (such as cartel formation or competition buyout), but has a more controversial reputation in combating network effects and providing access to markets.

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