The world is full of under-table agreements and transactions. They exist everywhere including private companies, governments and international bodies and committees. They are occupied by a few players. Most of the wealth on the Earth is controlled by those players. They control far more than wealth. They control the foreign exchange rates, tax rates, and even the price of most of the resources on the Earth.
By controlling the foreign exchange rates, those players are trying to exploit everyone on the Earth by making the rates go high and low and gain the difference. They earn huge profit by leveraging and we suffer loss due to unstable price on everything we need.