ZURICH (Reuters) -The Swiss National Bank, the Swiss Finance Ministry and the U.S. Treasury Department have reconfirmed that they do not target exchange rates for competitive purposes. In a joint statement, Switzerland and the U.S. both said they did not use exchange rates to win an unfair advantage or prevent adjustments to their balance of payments. A joint statement "confirms that foreign exchange market interventions are an important monetary policy instrument for the SNB in ensuring appropriate mo ...