Because every country and person trades at will in gold. Currently, 90% of the world's trade has to get the blessing of the United States. I'll go ahead and peace out, you have a lot of reading and research to do on how past and present monetary systems work. I'm not going to go back and forth on global monetary theory with someone that doesn't't understand the current systems of trade. No offense, but not worth my time to further this discussion. Have a good day.