Barro on the short-term and long-term impacts of the Obama (and Bush) "stimulus"

From Robert Barro in the WSJ...

The first anniversary of the Obama stimulus package generated a lot of discussion about whether and how much the package moderated the recession. These are complex questions...

We need to ask whether the government's spending reduced or enhanced private spending and whether public-sector hiring lowered or raised private hiring. This requires an empirical model based on the history of past fiscal actions in the U.S. or other countries....

I estimate a spending multiplier of around 0.4 within the same year and about 0.6 over two years. Thus, if the government spends an extra $300 billion in each of 2009 and 2010, GDP would be higher than otherwise by $120 billion in 2009 and $180 billion in 2010. These results apply for given taxes and, therefore, when spending is deficit-financed, as in 2009 and 2010. Since the multipliers are less than one, the heightened government outlays reduce other parts of GDP such as personal consumer expenditure, private domestic investment and net exports....

In other words, the deal looks pretty good in the short run because we "buy" the added government outlays by paying 60 cents on the dollar in 2009 (losing 180 in private spending to get 300 in government spending) and 40 cents on the dollar in 2010.

How attractive this short-run deal looks depends on how much one values the added governmental activity. If it's considered useful public investment—such as building a needed highway or, more modestly, fixing potholes—it might look good. If it's wasteful spending in a hastily constructed and highly political stimulus package, it looks bad.

But these calculations are not nearly the end of the story, because the added $600 billion of government spending leads to a correspondingly larger public debt. These added obligations must be paid for sometime by raising taxes (unless future government spending declines below its 2008 level, an unlikely scenario)....

GDP falls overall because the famous "balanced-budget multiplier"—the response of GDP when government spending and taxes rise together—is negative. This result accords with the familiar pattern whereby countries with larger public sectors tend to grow slower over the long term....viewed over five years, the fiscal stimulus package is a way to get an extra $600 billion of public spending at the cost of $900 billion in private expenditure. This is a bad deal.

The fiscal stimulus package of 2009 was a mistake. It follows that an additional stimulus package in 2010 would be another mistake.