Since China’s multilateral surplus is the economic issue and many countries are concerned about it, the US should seek a multilateral, rules-based solution. Imposing unilateral duties after unilaterally labeling China a “currency manipulator” would undermine the multilateral system, with little payoff. China might respond by imposing duties on those American products effectively directly or indirectly subsidized by America’s massive bailouts of its banks and car companies.
No one wins from a trade war. So America should be wary of igniting one in the midst of an uncertain global recovery – as popular as it might be with politicians whose constituents are justly concerned about high unemployment, and as easy as it is to look for blame elsewhere. Unfortunately, this global crisis was made in America, and America must look inward, not only to revive its economy, but also to prevent a recurrence.
Update: Krugman responds.
Update #2: See also Martin Wolf, who agrees with Krugman.