Cambio, cambio. Under the blazing sun, dozens of money changers are hawking US dollars along Florida Street, a bustling pedestrian strip in Buenos Aires. Known as arbolitos (little trees), they are thriving ahead of the 26 October midterm elections in a country long used to saving in the greenback. The best time to buy is now, says one arbolito, declining to give her name. [The dollar] went down a little but it is a fake-out it'll rise again.