Since 2006 the dollar has been losing ground in front of the other foreign currencies. One of the examples that we had in these last days was the fall of the dollar in front of the Japanese yen. After reaching a minimum value of 109,9 yenes per dollar, the trend changed and the Japanese currency devalued more than 0,3% against the dollar, finishing at 110.26%. During this last year the dollas has devalued a 7% regarding to the yen value.The decision of the Central Bank of Japan of manteining the level of the interest rates in a 0,5% annual, brought as a consequence that the dollar continue falling in front of the Japanese currency. Other factor that will be for the dollar were the declarations of Yasuo Fukuda, the first minister of Japan, that said that “the growing trend of the yen has been very fast and can become a problem in the short term”. These declarations brought calm to the markets and the dollar gained ground in front of the yen. There are some economies in which the strengthening of their local currencies in front of the dollar is not advisable as most of their exports are to the United States. A dollar devaluation, would decrease the amount of dollar incomes because of the exports.