The U.S. dollar really is everyone’s problem. There are more dollars in circulation worldwide than any other currency – perhaps more than all other currencies combined as a full two-thirds of the rest of the world’s foreign reserves are denominated in the U.S. dollar. It’s also true that two-thirds of all dollars circulate outside of the United States. They have long been the choice of exchange on the world’s black markets. The reason is because they are so recognizable and accepted everywhere e…