What is the U.S. dollar as an instrument for trading?  

Everyone refers to the U.S. dollar. But what does it really refer to when a trader considers action? The U.S. dollar can be an instrument for trading through the U.S. Dollar Index (USDX) traded on the New York Board of Trade. The USDX is recognized by hedge fund traders and worldwide as the instrument reflecting sentiment on the U.S. dollar. An additional way to trade the dollar is through any of the major currency pairs. The EUR/USD, the USD/CHF and other pairs with the dollar as part of the pair allows a trader to trade for or against the dollar but relative to the other pair.