The dollar fell to a low for the year Tuesday as gold prices shot above $1,000 an ounce before giving some ground and investors switched funds into riskier investments.
Commitments from global leaders this weekend to continue underwriting the global recovery helped drive investors away from the "safe haven" dollar and into emerging-market currencies and equities, analysts said.
Published comments from a Chinese government official in a British newspaper knocking the Federal Reserve's policy of buying bonds also drove the dollar lower, said Joseph Trevisani, chief market analyst at FXSolutions.
"The Chinese have serious influence," he said. China is the largest holder of U.S. Treasury securities, and its buying of U.S. debt enables the government to fund its deficit spending.
The 16-nation euro rose as high as $1.4535 in afternoon trading, its highest level this year, from $1.4337 late Monday, before backtracking to $1.4490 in later trading.
The British pound rose to $1.6494 from $1.6335, while the dollar dropped to 92.27 Japanese yen from 92.96 yen.
The dollar index fell as low as 77.05 against a basket of six major world currencies that includes the euro, yen, Canadian dollar, British pound, Swedish krona and Swiss franc. That's its lowest since last September.
Markets have been rising after finance officials from the Group of 20 leading economies pledged to maintain government spending, low interest rates and expansion of the money supply in order to buck up the global economy. The ministers met this weekend in London.
Those moves could help boost economic activity and liquidity in financial markets, but can weigh on the value of a currency. The current U.S. rate near zero means investors can earn better returns on their funds in countries with higher yields, such as, for example, Poland, Turkey, Brazil and Australia.
"People are loading up on high-yielders," said Win Thin, senior currency strategist at Brown Brothers Harriman in New York, as they get more optimistic about the global economy's growth outlook.