Many, if not all, of the world's most pressing macroeconomic problems relate to the massive overhang of all forms of debt. In Europe, a toxic combination of public, bank and external debt in the periphery threatens to unhinge the eurozone.
Across the Atlantic, a standoff between the Democrats, the tea party and old-school Republicans has produced extraordinary uncertainty about how the United States will close its 8 percent-of-GDP government deficit over the long term. Japan, meanwhile is running a 10 percent-of-GDP budget deficit, even as growing cohorts of new retirees turn from buying Japanese bonds to selling them.
Aside from wringing their hands, what should governments be doing? One extreme is the simplistic Keynesian remedy that assumes that government deficits don't matter when the economy is in deep recession; indeed, the bigger the better. At the opposite extreme are the debt-ceiling absolutists who want governments to start balancing their budgets tomorrow (if not yesterday). Both are dangerously facile.