The capitals market suffers daily constant changes, and with them, the quotation of international foreign currencies. The fluctuations seen in the last months, above all during the mortgage crisis of the United States has provoked some instability in the prices of international foreign currencies. During these last days the dollar quotation took a preference place in newspapers and international media, as the amount of this currency has fallen regarding other pairs of other countries. The stregthening of the maggior part of international foreign currencies in front of the dollar make markets be in alert, even if the sensation that there is in the financial world at the moment is that this trend will change and the American currency will be appreciated again. Although some speculations that there are about the future of the dollar, while deciding in which international foreign currencies invest traders have been prudent, that’s why while deciding they have chosen those pairs that are actually object of minor speculation as the EUR/CAD, EUR/GBP or EUR/CHF.