1.  They are trading in their dollars for any other reliable currency.

2.  Currency traders said investors do not see the euro as a safe haven and prefer to buy dollars considered as a more reliable currency in difficult times.

3.  The dollar jumped against the yen Friday as investors fearing instability in other Asian currencies sought the U.S. currency as the most reliable currency.

4.  The U.S. dollar rose sharply against the yen Friday as investors fearing instability in other Asian currencies looked to the dollar as the most reliable currency.