For the US, the yuan's exchange rate is only a tactical - or official - excuse that hides its real intention.It is actually aimed at forcing China to help the US overcome its Treasury bond crisis.To cope with US's pressure on the yuan's revaluation, China has to devise an optimal strategy at the bargaining table.

After the US Treasury Secretary Timothy F. Geithner said the April 15 report on whether China manipulates its currency had been deferred, a section of the media began saying it was a sign of warming up of Sino-American ties and that the dispute over the yuan's exchange rate might be resolved peacefully.

But for Song Hongbing, president of newly set up think tank Global Business & Finance Institute, there is no easy answer to the Sino-US dispute over the yuan.

As a grassroots economic observer who is active in the media now, Song became famous in 2007 for his popular book, Currency War. He says in the book that "bloodless currency wars" will replace military confrontations among the big powers. The dispute over the yuan is a typical currency war which, he says, proves his claim.

Song says the yuan's exchange rate is no longer an economic issue; it has become a political issue. But he doesn't agree with the simple explanation that the US is pressuring China to revalue the yuan merely because it is looking for a scapegoat for its huge trade deficit and high rate of unemployment. From 2005 to 2008, the yuan's exchange rate against US dollar has increased by 21 percent. But despite that America's trade deficit has increased. So a revalued yuan alone cannot solve America's domestic problems.

In the US, many low-end industries, such as textiles, have been outsourced to overseas destinations. And even if China reduces its exports to the US in these sectors, American companies will not produce these goods at home simply because the labor cost would be too high. "So it's obvious that China is not responsible for America's domestic problems," Song says.

The US has been saying that the "yuan is undervalued" because it has an ulterior motive. Or else, why has it ignored the analyses of a large number of economists that the yuan is not undervalued? What the US has done is selectively chosen some "theories" to support its stance. More interestingly, even in US' own analysis the yuan is not the world's most undervalued currency. "But the US has singled out China," Song says. "That's why I say the revaluation of the yuan is not merely an economic issue."

For the US, the yuan's exchange rate is only a tactical - or official - excuse that hides its real intention. "The currency war is a strategic game among big powers. It's crucial and thus unavoidable."

The so-called "undervalued yuan" is only a virtual bargaining chip for the US in its game against China. It is actually aimed at forcing China to help the US overcome its Treasury bond crisis. Because of the huge financial deficit, matured bonds (including Fannie Mae and Freddie Mac's mortgage bonds) and interests that the US has to account for, its government's financing scale is up to $3.5 trillion this year. But it still has a financing gap of at least $1.5 trillion, which could hurt its economic recovery seriously. "That is the reason why the US has created a series of disputes across the world, including the one over the yuan." Song says that what the US "wants is to find someone to cover its huge financing gap".