The U.S. dollar is on a roll. The dollar index, which measures its value versus a basket of other world currencies, is at a four-year high. John Mauldin, best-selling author and chairman of Mauldin Economics says, get used to it. Mauldin believes the dollar is going to keep rising and “get a lot stronger than anyone can imagine.” He says, “We are going to be trading stronger against nearly every currency.“ In other parts of the world, currencies are slipping as the U.S. dollar strengthens. Central banks in Europe and Japan are shifting policies to fight slowing growth and fend...