Time for more stimulus: it's do or die.

• Author: Stiglitz, Joseph E.

As the green shoots of economic recovery that many people spied this spring have turned brown, questions are being raised as to whether the policy of jump-starting the economy through a massive fiscal stimulus has failed, Has Keynesian economics been proven wrong now that it has been put to the test?

That question, however, would make sense only if Keynesian economics had really been tried. Indeed, what is needed now is another dose of fiscal stimulus. If that does not happen, we can look forward to an even longer period in which the economy operates below capacity, with high unemployment.

The Obama administration seems surprised and disappointed with high and rising joblessness. It should not be. All of this was predictable. The true measure of the success of the stimulus is not the actual level of unemployment, but what unemployment would have been without the stimulus. The Obama administration was always clear that it would create some three million jobs more than what would otherwise be the case. The problem is that the shock to the economy from the financial crisis was so bad that even Obama's seemingly huge fiscal stimulus has not been enough.

But there is another problem: In the United States, only about one-quarter of the almost $800 billion stimulus was designed to be spent this year, and getting it spent even on "shovel ready" projects has been slow going. Meanwhile, U.S. states have been faced with massive revenue shortfalls, exceeding $200 billion. Most face constitutional requirements to run balanced budgets, which means that such states are now either raising taxes or cutting expenditures--a negative stimulus that offsets at least some of the Federal government s positive stimulus.

At the same time, almost one-third of the stimulus was devoted to tax cuts, which Keynesian economics correctly predicted would be relatively ineffective. Households, burdened with debt while their retirement savings wither and job prospects remain dim, have spent only a fraction of the tax cuts.

In the United States and elsewhere, much attention was focused on fixing the banking system. This may be necessary to restore robust growth, but it is not sufficient. Banks will not lend if the economy is in the doldrums, and American households will be particularly reluctant to borrow--at least in the profligate ways they borrowed prior to the crisis. The almighty American consumer was the engine of global growth, but it will most likely continue to...