The weak economic recovery in the U.S. and the even weaker performance in much of Europe have renewed calls for ending budget austerity and returning to larger fiscal deficits. Curiously, this plea for more fiscal expansion fails to offer any proof that Organization for Economic Cooperation and Development (OECD) countries that chose more budget stimulus have performed better than those that opted for more austerity. Similarly, in the American context, no evidence is offered that past U.S. budget deficits (averaging 9% of GDP between 2009 and 2011) helped to promote the economic recovery.

Two interesting European cases are Germany and Sweden, each of which moved toward rough budget balance between 2009 and 2011 while sustaining comparatively strong growth—the average growth rate per year of real GDP for 2010 and 2011 was 3.6% for Germany and 4.9% for Sweden. If austerity is so terrible, how come these two countries have done so well?

The OECD countries most clearly in or near renewed recession—Greece, Portugal, Italy, Spain and perhaps Ireland and the Netherlands—are among those with relatively large fiscal deficits. The median of fiscal deficits for these six countries for 2010 and 2011 was 7.9% of GDP. Of course, part of this pattern reflects a positive effect of weak economic growth on deficits, rather than the reverse. But there is nothing in the overall OECD data since 2009 that supports the Keynesian view that fiscal expansion has promoted economic growth.

For the U.S., my view is that the large fiscal deficits had a moderately positive effect on GDP growth in 2009, but this effect faded quickly and most likely became negative for 2011 and 2012. Yet many Keynesian economists look at the weak U.S. recovery and conclude that the problem was that the government lacked sufficient commitment to fiscal expansion; it should have been even larger and pursued over an extended period.

This viewpoint is dangerously unstable. Every time heightened fiscal deficits fail to produce desirable outcomes, the policy advice is to choose still larger deficits. If, as I believe to be true, fiscal deficits have only a short-run expansionary impact on growth and then become negative, the results from following this policy advice are persistently low economic growth and an exploding ratio of public debt to GDP