Which of the following is not an economic grouping?

Out of the given options, ECOMOG is not an economic grouping. ECOMOG stands for Economic Community of West African States Monitoring Group, which was a military intervention force formed by the Economic Community of West African States (ECOWAS) to intervene in the civil wars and conflicts in West Africa. While ECOWAS, GATT, and EEC are all economic groupings. ECOWAS (Economic Community of West African States) is a regional economic union made up of West African countries aimed at promoting economic integration and cooperation among its members. GATT (General Agreement on Tariffs and Trade) was an international trade agreement signed in 1947, which aimed to reduce trade barriers and increase international trade among its member countries. EEC (European Economic Community) was the precursor to the European Union, which was formed in 1957 and aimed at promoting economic cooperation and integration among European countries.