Jeffry Frieden, Professor of Government at Harvard, has a new Council of Foreign Relations working paper “Global Imbalances, National Rebalancing, and the Political Economy of Recovery” :
Global macroeconomic imbalances — massive borrowing by some countries and massive lending by others — drove the financial boom and bubble that eventually burst into the current crisis. There is now nearly universal agreement that such imbalances cannot be sustained, and that the former deficit and surplus nations need to move toward macroeconomic balance.