The PowerShares U.S. Dollar Bullish (NYSE: UUP ) has been trending strongly higher over the last two months and may indicate investors exchanging money back into paper assets rather than commodities. This ETF is designed to hold physical silver bars in vaults in London and New York as a proxy to directly owning this precious metal. Related Link: 3 Global ETFs With Sky-High Dividends Falling interest rates and a rising U.S. dollar have been additional reasons for investors to sell silver as an inflation hedge.