I first wrote about this inverse dollar fund in April 2006 and again on July 13 of this year. The ProFund Falling US Dollar Fund (FDPIX) is a mutual fund designed to trade in the opposite direction of the US Dollar Index. In other words, the fund rises when the dollar falls (hence its name). As I've suggested in the past, investors can use this fund to profit from a falling dollar. Chart 1 (plotted through 9/9) shows the Falling Dollar Fund trading at a new 12-year high. An alternative to buying a dollar inverse fund is to buy a foreign currency ETF. Chart 2 shows the Currency Shares Euro Trust (FXE) hitting a new high on 9/20 along with the Euro.