Antitrust regulation aims to prevent unfair practices in the market. The article discusses the problems with states getting involved in antitrust cases, using the Microsoft case as an example. State intervention can complicate cases, increase costs, and create legal uncertainties. The focus should be on efficiency and fairness rather than individual state interests. The article suggests limiting state involvement in cases that go beyond state borders. While a global antitrust authority could be beneficial, practical challenges currently prevent its implementation.