Currency War of 2009–11 US, and Financial Times journalists have suggested that if China returned to a fixed peg against the dollar this could re-ignite the Currency War, especially if the move coincided with the US presidential election campaign. Also in March 2012, Brazil's president Rousseff said her country was still experiencing undesirable upwards pressure on her currency, with her Finance Minister Guido Mantega saying Brazil will no longer "play the fool" and allow others to get away with competitive devaluation, announcing new measures aimed at limiting further appreciation for the Real. In June 2012, the "Financial Times" reported that while international trade remained
World currency a single world currency is unnecessary, because the U.S. dollar is providing many of the benefits of a world currency while avoiding some of the costs. If the world does not form an optimum currency area, then it would be economically inefficient for the world to share one currency. In the present world, nations are not able to work together closely enough to be able to produce and support a common currency. There has to be a high level of trust between different countries before a true world currency could be created. A world currency might even undermine national sovereignty