Does Barro understand Barro?

Clive Crook writes,

Thanks, Robert, especially for that last clarification. I have to admit that I haven't been giving much thought to the scenario in which a deficit-financed stimulus has no effect (under Ricardian equivalence) on aggregate demand and yet still has a big multiplier. I will have to think about that one...

I have always thought about Barro's Ricardian equivalence as treating any government deficit as if it were financed by taxes. That is, when people see the government borrow money, they anticipate a future taxes, and they adjust their spending exactly as if the taxes were being levied today.

So, we describe fiscal policy by saying "____ is financed by a tax increase."  So, if the government tries a tax cut, we say, "a tax cut financed by a tax increase."  I see that as obviously self-canceling, with a multiplier of zero.  Because Barro now implies otherwise, Clive Crook is confused, and so am I. 

On the other hand an increase in government spending that is financed by borrowing should, in a Barro world, be treated as an increase in government spending financed by an increase in taxes. Thus, the multiplier should equal the so-called "balanced budget multiplier,"   which can be greater than zero. 

Barro himself writes (as quoted by Crook):

The multiplier has to do with how a change in aggregate demand affects output.

I think of the multiplier as the product of two factors--how much the policy affects aggregate demand and how much the change in aggregate demand affects output.  I imagine that Crook is thinking the same thing, in which case a tax cut in a Barro world should have a mulitiplier of zero.

Presented by

Arnold Kling

Arnold Kling earned his Ph.D in economics at MIT. He was an economist on the staff of the Federal Reserve Board. From 1986-1994 he worked at Freddie Mac. He started Homefair.com in 1994 and sold it in 1999. His fourth book, From Poverty to Prosperity, co-authored with Nick Schulz, is due out in April of 2009. He blogs regularly at Econlog.

Never Tell People How Old They Look

Age discrimination affects us all. Who cares about youth? James Hamblin turns to his colleague Jeffrey Goldberg for advice.

Join the Discussion

After you comment, click Post. If you’re not already logged in you will be asked to log in or register.

blog comments powered by Disqus

Video

Never Tell People How Old They Look

Age discrimination affects us all. James Hamblin turns to a colleague for advice.

Video

Would You Live in a Treehouse?

A treehouse can be an ideal office space, vacation rental, and way of reconnecting with your youth.

Video

Pittsburgh: 'Better Than You Thought'

How Steel City became a bikeable, walkable paradise

Video

A Four-Dimensional Tour of Boston

In this groundbreaking video, time moves at multiple speeds within a single frame.

Video

Who Made Pop Music So Repetitive? You Did.

If pop music is too homogenous, that's because listeners want it that way.

More in Business

Just In