PowerShares DB U.S. Dollar Index Bullish ( UUP ), a measure of the greenback against a batch of foreign currencies, fell 0.3% to 21.82. Shutterstock photo Gold prices rallied Thursday and the dollar fell after Spain released its 2013 budget and the U.S. reported pending-home sales weakened in August. Tom McClellan, editor of the McClellan Market Report, believes gold will reach $2,900 an ounce if the Federal Reserve's current quantitative easing program leads to inflation levels seen after the Civil War, when the country printed money to finance that war and post-war reconstruction.