The head of the International Monetary Fund (IMF) has repeated calls for China to let its currency rise, saying that a stronger yuan would improve the country's economy.
The comments by Dominique Strauss-Kahn came as Barack Obama, the US president, took a similar message to China's leaders in his first visit to the country since taking office.
Manufacturers in the US argue that Beijing gives its exporters an unfair price advantage by keeping the yuan undervalued.
"A stronger currency is part of the package of necessary reforms,'' Strauss-Kahn said in a speech at a finance conference in Beijing.
"Allowing the renminbi [Chinese yuan] and other Asian currencies to rise would help increase the purchasing power of households, raise the labour share of income and provide the right incentives to reorient investment."
The Chinese government broke the yuan's direct link with the dollar in mid-2005 and allowed it to rise by more than 20 per cent against the US currency over the next three years.
But that increase stopped in late 2008 as Beijing tried to help its exporters stay competitive amid declining demand. The yuan has held steady against the dollar since then.
At a separate news conference, a spokesman for the Chinese commerce ministry told reporters that Chinese exporters do not see trade improving and need a stable exchange rate.
Key reserve currency
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"If we only ask other countries to appreciate their currencies while the dollar is declining, it is not good for the world economic recovery," Yao Jian said.
Yao added that the impact of the exchange rate on China's trade surplus was "very small".
Despite the ongoing problems in the international monetary system, Strauss-Kahn said the US dollar would remain the key reserve currency "for some time".
China and Russia have expressed concern about the dollar's stability and called for creation of an alternative currency, possibly one managed by the IMF.
On the global economy, Strauss-Kahn warned that the recent recovery is
uneven and said governments should avoid withdrawing stimulus measures too
"The biggest risk is a premature withdrawal of policy stimulus," he said.
"While it is prudent to plan for so-called 'exit strategies,' policy makers should keep supportive measures in place until a recovery is firmly established, and particularly until conditions are in place for unemployment to decline."