Free economic zones (FEZ) or free zones (FZ) are a class of special economic zone (SEZ) designated by the trade and commerce administrations of various countries. The term is used to designate areas in which companies are taxed very lightly or not at all in order to encourage economic activity. The taxation rules are determined by each country. The World Trade Organization (WTO) Agreement on Subsidies and Countervailing Measures (SCM) has content on the conditions and benefits of free zones.