How is monopoly illegal?

Monopoly is illegal under antitrust laws because it restricts competition, leading to higher prices, reduced innovation, and limited choices for consumers. In the United States, the Sherman Antitrust Act and the Clayton Act prohibit monopolistic practices and promote fair competition. When a company uses unfair practices to dominate a market, it can face legal action from the government or private parties. These laws aim to maintain a competitive market landscape that benefits consumers and the economy.