The US is going to win this war, one way or the other: it will either inflate the rest of the world or force their nominal exchange rates up against the dollar. Unfortunately, the impact will also be higgledy piggledy, with the less protected economies (such as Brazil or South Africa) forced to adjust and others, protected by exchange controls (such as China), able to manage the adjustment better.
It would be far better for everybody to seek a co-operative outcome. Maybe the leaders of the group of 20 will even be able to use their “mutual assessment process” to achieve just that. Their November summit in Seoul is the opportunity. Of the need there can be no doubt. Of the will, the doubts are many. In the worst of the crisis, leaders hung together. Now, the Fed is about to hang them all separately.