Think with me, USA has a huge influence in world economy for many reasons, and one of it is almost all international transactions being made in Dollar, a few exceptions goes for Euro, Yen and more recently Renmibi ( or Yuan). A coin that is made only for international exchanges, that isn`t owned by any country, but by an international organization, that main goal is to make all countries immune to other countries messing up their exchange rate.
I read, for example, that China has the biggest reserve of dollars of the world, something near 4.5 trillion, and they are the biggest holder of USA public debit papers. If they wish, they can send USA economy to space just by releasing all this money in the market and making the dollar loose it`s value. They don`t because they have interest in keeping USA as health as possible, just like USA can just destroy China with a pen just by passing a rule that they won`t import goods from China.
