Competition rules and all must obey the law of supply and demand. The world market has decided it wants one currency: the U.S. dollar. Sure, some places use other kinds but they all evenutally end up going back to using dollars. Kind of like Windows vs OS. I recently visited a factory making Apple computers and computer systems for running the line and QC used applications on Windows platforms.
SCREECH, SCREECH!!! Heathen!!! Heretic!!! Apostate!!! You just wait until the witch-burning detail gets here!!
Interesting and I do prefer King Dollar to any other world currency king. At least we have a historical commitment to free markets and free trade.