Sooner or later, Euro and Yen will go down following the move of Dollar so as to keep their respective competitive-edge. Therefore, speculating on the trend of the exchange rate between major currencies can be dangerous. On the other hand, since the long-term trend of the world currencies is downward, under the pressure of Dollar, it would be relatively safe to invest in precious metals and natural resources, instead. These commodity-related securities will be likely to go up as the demand-supply balance shifts to the demand side and the major currencies move down in value coherently.