The document talks about how rules are set for subsidies in the service sector under the General Agreement on Trade in Services (GATS). The researchers explain why regulating these subsidies is more complex than for goods like food or machines. They look at how subsidies affect trade in services, categorizing them based on their impact. The document also discusses existing GATS rules that control subsidies and mentions whether it's a good idea to have countermeasures. Additionally, the authors explore how subsidies influence foreign investments and the audiovisual industry. In summary, the document provides a detailed look at subsidies in services under the GATS and how they are regulated.