Yen And Swiss Franc The Rydex CurrencyShares Japanese Yen ETF (NYSEArca:FXY) gained 2.5 percent in the last two weeks, and the Rydex CurrencyShares Swiss Franc ETF (NYSEArca:FXF) did even better, with a 5 percent gain. While the Swiss franc and the yen could be considered safe havens within the currency market, the euro and British pound are outperforming for a different reason. As the Federal Reserve appears to be OK with the scenario of low interest rates for the foreseeable future-even at the risk of high inflation-European policymakers are suggesting they're going in a different direction.