Harvard Prof on Attack Against Keynesianism

Robert Barro, an economics professor at Harvard and a senior fellow at Stanford's Hoover Institution, smashes Keynesian economics, in a new WSJ piece.

Here's the takeaway:

Keynesian economics—the go-to theory for those who like government at the controls of the economy—is in the forefront of the ongoing debate on fiscal-stimulus packages. For example, in true Keynesian spirit, Agriculture Secretary Tom Vilsack said recently that food stamps were an "economic stimulus" and that "every dollar of benefits generates $1.84 in the economy in terms of economic activity." Many observers may see how this idea—that one can magically get back more than one puts in—conflicts with what I will call "regular economics." What few know is that there is no meaningful theoretical or empirical support for the Keynesian position...

Keynesian economics argues that incentives and other forces in regular economics are overwhelmed, at least in recessions, by effects involving "aggregate demand." Recipients of food stamps use their transfers to consume more. Compared to this urge, the negative effects on consumption and investment by taxpayers are viewed as weaker in magnitude, particularly when the transfers are deficit-financed.

Thus, the aggregate demand for goods rises, and businesses respond by selling more goods and then by raising production and employment. The additional wage and profit income leads to further expansions of demand and, hence, to more production and employment. As per Mr. Vilsack, the administration believes that the cumulative effect is a multiplier around two.

If valid, this result would be truly miraculous...

How can it be right? Where was the market failure that allowed the government to improve things just by borrowing money and giving it to people? Keynes, in his "General Theory" (1936), was not so good at explaining why this worked, and subsequent generations of Keynesian economists (including my own youthful efforts) have not been more successful... there is zero evidence that deficit-financed transfers raise GDP and employment—not to mention evidence for a multiplier of two.

...the administration created one informative data point by dramatically raising unemployment insurance eligibility to 99 weeks in 2009—a much bigger expansion than in previous recessions. Interestingly, the fraction of the unemployed who are long term (more than 26 weeks) has jumped since 2009—to over 44% today, whereas the previous peak had been only 26% during the 1982-83 recession. This pattern suggests that the dramatically longer unemployment-insurance eligibility period adversely affected the labor market..

The administration found the evidence it wanted—multipliers around two—by consulting some large-scale macro-econometric models, which substitute assumptions for identification. These models were undoubtedly the source of Mr. Vilsack's claim that a dollar more of food stamps led to an extra $1.84 of GDP. This multiplier is nonsense, but one has to admire the precision in the number.

This is a fascinating attack on Keynesianisn and mumbo-jumbo econometrics. Barro has an undergraduate degree in physics from the California Institute of Technology (1965), where he studied under Richard Feynman. It's really the true mathematical types---outside of mainstream economics--- that are among the first to spot the voodoo in econometrics.

There's a lot that Barro has written that I would disagree with, but this WSJ article is pretty much an inside the palace prince taking a shot at the King. Awesome.