http://www.economist.com/finance/displayStory.cfm?Story_id=4223552(requires a subscription)
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Last week's 2.1% revaluation of the yuan is trivial and unlikely to dent America's trade deficit. More important is the breaking of the yuan's formal link to the dollar and the shift to a so-called “managed float” against a basket of currencies. In theory, this allows considerable scope for a further rise in the yuan against the dollar, though it is unclear by how much the Chinese authorities will allow the yuan to climb.
Even if last week's adjustment was timid, it could mark an important turning point. It is certainly a step in the right direction for China itself, as greater currency flexibility will give it more room to use monetary policy to steer the economy. More interesting are the implications for the world economy. This might be the beginning of the end of what has been dubbed a revived Bretton Woods system of fixed exchange rates between China (and other Asian economies) and America.
Under this arrangement, China has provided cheap finance to America's consumers and its government by buying Treasury bonds. If the switch to a currency basket causes China to reduce its new purchases of dollar assets, then American bond yields could rise. America's China bashers, who demand a further revaluation of 25% or more, should therefore be careful. Such a large-scale revaluation would surely push bond yields higher and badly hurt America's economy. Indeed, if the yuan's adjustment has any real impact on America's trade deficit, it will not be through the revaluation itself, but because higher bond yields squeeze domestic demand.
America's trade deficit is due mainly to excessive spending and inadequate saving, not to unfair Chinese competition. If China has contributed to America's deficit it is not through its undervalued exchange rate, but by holding down bond yields and so fuelling excessive household borrowing and spending. From this point of view, global monetary policy is now made in Beijing, not Washington.
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