The U.S. dollar index is a basket of six major world currencies stacked up against the greenback. The USDX has surged to a six-week high this week, on safe-haven demand amid worries about Italy’s financial and economic condition, and on the bullish impact on the U.S. economy from the U.S.-Mexico-Canada trade agreement. Now, it appears the USDX will soon challenge the summertime high. Stay tuned!