The Mexican peso strengthened 0.52 percent to 12.525 per dollar. Mounting speculation that the Federal Reserve may soon pump more money into the US economy has caused the dollar to plunge this week, boosting the region's higher yielding currencies.
"The Fed has been very clear in that low rates will continue for some time, and this will punish the dollar, which is positive for the peso," said Ramon Cordova, a trader at brokerage BASE in Monterrey, Mexico. "Inclusion in this index gives greater certainty to the economic situation in the country and attracts foreign investment," Mexico's Finance Minister Ernesto Cordero told local radio on Friday. "The flow of dollars strengthens our currency."