When Dorothy and her friends finally reach Oz, they present themselves to the almighty Wizard, only to eventually discover that he is just an illusion maintained by a charlatan hiding behind a curtain. This seems eerily akin to to the state of Keynesian economics. It does not matter that Keynesianism isn’t working for Obama. It does not matter that it didn’t work for Bush, or for Japan in the 1990s, or for Hoover and Roosevelt in the 1930s.

In the ultimate triumph of theory over reality, the Keynesians say all that matters is the macroeconomic model behind the curtain showing that more government spending leads to more jobs and growth. Consider the recent report from the Congressional Budget Office (CBO), which claimed that Obama’s stimulus created at least one million jobs. As Brian Riedl of the Heritage Foundation noted:
CBO’s calculations are not based on actually observing the economy’s recent performance. Rather, they used an economic model that was programmed to assume that stimulus spending automatically creates jobs — thus guaranteeing their result. …The problem here is obvious. Once CBO decided to assume that every dollar of government spending increased GDP…, its conclusion that the stimulus saved jobs was pre-ordained.
But surely this can’t be true, you may be thinking. Our public servants in Washington would not make important policy decisions based on a model that automatically produces a certain result, would they? Peter Suderman of Reason pulls aside the curtain:
…those reports rely on assumption-packed models that effectively predetermine their outcomes; what they say, in essence, is that the stimulus worked because we assume it did. …That’s especially true when estimating government spending’s productive effects, which is accomplished by plugging numbers into a formula that assumes that government spending produces a multiplier—an increased return for every government dollar spent. In other words, it extrapolates from how much money is put in rather than from what has actually come out. And it does so using a formula that dictates that if money is put in, even more money will come out. According to the CBO’s estimates, depending on how the money is spent, one dollar of government spending can produce total economic activity of up to $2.50. What a deal! …for all practical purposes, the same multipliers that were used to predict how many jobs would be created are being used to estimate how many jobs have been created.
(more…)