Surplus countries are therefore expected to shift  2  2  Emerging Markets come of Age, Finance and Development, December 2010, Vol 47, No 4  BIS central bankers’ speeches  focus from external demand to domestic demand in order to sustain growth. In contrast, deficit economies will need to rely more on external demand.
This implies that exchange rates will adjust, with the exchange rates of deficit economies depreciating, while the surplus economies will need to let their currencies appreciate. As you can well imagine, this is a contentious issue amongst G20 countries, given that developed and developing economies have differing policy priorities.