The U.S. dollar index is a basket of six major currencies weighted against the greenback. See on the daily bar chart that the USDX has just hit a 4.5-month high and the bulls have restarted a price uprend. The stronger U.S. dollar is a negative element for many raw commodity markets. Reason: Many raw commodities are priced in U.S. dollars on the world markets. When the dollar appreciates, it makes those commodities more expensive to purchase in non-U.S. currency. Stay tuned!