But today comes word that the government will do just that. 

Bloomberg: "Brazil will impose taxes on purchases by foreign investors of real-denominated, fixed-income securities and on purchases of stocks, Finance Minister Guido Mantega said today. The measures are being taken 'to avoid an excess speculation in the stock market and in capital markets,' he told reporters in Sao Paulo."

Read the whole thing >

Brazil's intervention follows a recent move by some Asian nations to prevent their currencies from surging.