Those who heaped high praise on Keynesian policies have grown silent as government spending has failed to bring an economic recovery. Except for a few diehards who want still more government spending, and those who make the unverifiable claim that the economy would have collapsed without it, most now recognize that more than a trillion dollars of spending by the Bush and Obama administrations has left the economy in a slump and unemployment hovering above 9%.

Why is the economic response to increased government spending so different from the response predicted by Keynesian models? What is missing from the models that makes their forecasts so inaccurate? Those should be the questions asked by both proponents and opponents of more government spending. Allow me to suggest four major omissions from Keynesian models:

First, big increases in spending and government deficits raise the prospect of future tax increases. Many people understand that increased spending must be paid for sooner or later. Meanwhile, President Obama makes certain that many more will reach that conclusion by continuing to demand permanent tax increases. His demands are a deterrent for those who do most of the saving and investing. Concern over future tax rates is one of the main reasons for heightened uncertainty and reduced confidence. Potential investors hold cash and wait.

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