The U.S. dollar index is a basket of six major world currencies weighted against the greenback. See on the daily bar chart for the USDX that prices this week have powered to a multi-month high. The dollar is seeing appreciation from a strong U.S. economy and on safe-haven demand amid wobbly world stock markets. Remember that trends in the currency markets tend to be stronger and longer-lasting that price trends in other markets. Thus, the dollar could continue to gain in the coming weeks, or longer. Stay tuned!