When devising its fiscal package, the Obama administration relied on conventional economic models based in part on ideas of John Maynard Keynes. Keynesian theory says that government spending is more potent than tax policy for jump-starting a stalled economy. The report in January put numbers to this conclusion. It says that an extra dollar of government spending raises GDP by $1.57, while a dollar of tax cuts raises GDP by only 99 cents. The implication is that if we are going to increase the budget deficit to promote growth and jobs, it is better to spend more than tax less.As I've said.
But various recent studies suggest that conventional wisdom is backward.
One piece of evidence comes from Christina D. Romer, the chairwoman of the president’s Council of Economic Advisers. In work with her husband, David H. Romer, written at the University of California, Berkeley, just months before she took her current job, Ms. Romer found that tax policy has a powerful influence on economic activity. According to the Romers, each dollar of tax cuts has historically raised G.D.P. by about $3 -- three times the figure used in the administration report. That is also far greater than most estimates of the effects of government spending.
Other recent work supports the Romers’ findings. In a December 2008 working paper, Andrew Mountford of the University of London and Harald Uhlig of the University of Chicago apply state-of-the-art statistical tools to United States data to compare the effects of deficit-financed spending, deficit-financed tax cuts and tax-financed spending. They report that "deficit-financed tax cuts work best among these three scenarios to improve G.D.P."
My Harvard colleagues Alberto Alesina and Silvia Ardagna have recently conducted a comprehensive analysis of the issue. In an October study, they looked at large changes in fiscal policy in 21 nations in the Organization for Economic Cooperation and Development. They identified 91 episodes since 1970 in which policy moved to stimulate the economy. They then compared the policy interventions that succeeded -- that is, those that were actually followed by robust growth -- with those that failed.
The results are striking. Successful stimulus relies almost entirely on cuts in business and income taxes. Failed stimulus relies mostly on increases in government spending.
(via Mankiw's Blog)