Antitrust authorities are government agencies responsible for promoting fair competition and preventing monopolies in the marketplace. They ensure that businesses do not engage in practices that unfairly limit competition, such as price-fixing or creating barriers for new companies. These authorities help maintain a healthy economy by protecting consumers and encouraging innovation. In many countries, antitrust authorities can investigate companies, impose fines, and block mergers that could harm competition. Examples of such agencies include the Federal Trade Commission (FTC) in the United States and the European Commission in the European Union. Their goal is to create a level playing field for all businesses.