The UN is not really a serious reference for anything. It’s just a role-playing fantasy game.
The Organisation for Economic Co-operation and Development (OECD) is taken seriously at providing economic definitions and data.
Most economic data is abstracted selectively to serve some political purpose. Probably no one would be much interested in aggregate economic data if there was no political opportunity to be made from it.
For an RPG, it’s still dangerous enough when its charter is based on Stalin’s constitution.