Anatole Kaletsky writes in Reuters, The takeaway from six years of economic troubles? Keynes was right.
Thus the six years since 2008 have provided strong empirical support for the supposedly outmoded Keynesian view that government borrowing is more powerful than monetary policy in stimulating severely depressed economies and pulling them out of recession. In a sense, it is odd that the power of fiscal policy has come as a surprise – or that it continues to be categorically denied by the German government and the U.S. Tea Party. The underlying reason why fiscal policy is so important in recessions, and has now come to dominate over monetary policy, is a matter of simple arithmetic that should not be open to debate.
Recessions generally occur when private business and households decide to spend less than their incomes in order to reduce their debts or increase their savings. If this process of “deleveraging” is happening in the private sector, which it clearly has been, then simple arithmetic shows that economic balance can only be restored if some other sector of the economy spends more than its income – and such excess spending is only possible if that “other sector” is willing to increase its debts. Disregarding the role of exports and imports, which must sum to zero for the world as a whole, the government is the only possible candidate to play the crucial balancing role as the “other sector.” It is therefore a mathematical certainty that governments must increase their borrowing whenever businesses and households decide to boost their savings by spending less than they earn.