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 is starting to trend up. A continued rally in the USDX would likely have implications for several other markets, including suggesting rising U.S. Treasury yields and falling gold prices. But for the rally in the USDX to become a sustained one, the greenback bulls will have to push prices above strong chart resistance at the May high. Stay tuned! Jim Wyckoff