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<正>The case for stabilizing China’s exchange rate against the dollar is strong.Before 2005 when the yuan/dollar rate was credibly fixed,it helped anchor China’s domestic price level.But gradual RMB appreciation from July 2005 to July 2008 created a"one-way-bet"that disordered China’s financial markets in two respects:(1) no private capital outflows to finance China’s huge trade surplus leading to an undue build up of official exchange reserves and erosion of monetary control,and(2) a breakdown of the forward exchange market in 2007-08 so that exporters could no longer get trade credit—probably worsening the severe slump in Chinese exports.But after July 2008,the credit crunch induced an unexpected unwinding of the dollar carry trade leading to a sharp appreciation in the dollar’s effective exchange rate.The People’s Bank of China(PBC) then stopped RMB appreciation against the dollar.China’s forward exchange market was restored and monetary control regained.Now the PBC can better support the fiscal stimulus by promoting a parallel expansion of bank credit.But,since March 2009,the fall in the dollar(with the RMB tied to it) again threatens to undermine the yuan/dollar rate and China’s monetary stability.