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Stimulus arithmetic (wonkish but important)
Friday, January 30, 2009
By Paul Krugman
The New York Times
Bit by bit we’re getting information on the Obama stimulus plan, enough to start making back-of-the-envelope estimates of impact. The bottom line is this: we’re probably looking at a plan that will shave less than 2 percentage points off the average unemployment rate for the next two years, and possibly quite a lot less. This raises real concerns about whether the incoming administration is lowballing its plans in an attempt to get bipartisan consensus.
In the extended entry, a look at my calculations.
The starting point for this discussion is Okun’s Law, the relationship between changes in real GDP and changes in the unemployment rate. Estimates of the Okun’s Law coefficient range from 2 to 3. I’ll use 2, which is an optimistic estimate for current purposes: it says that you have to raise real GDP by 2 percent from what it would otherwise have been to reduce the unemployment rate 1 percentage point from what it would otherwise have been. Since GDP is roughly $15 trillion, this means that you have to raise GDP by $300 billion per year to reduce unemployment by 1 percentage point.
Now, what we’re hearing about the Obama plan is that it calls for $775 billion over two years, with $300 billion in tax cuts and the rest in spending. Call that $150 billion per year in tax cuts, $240 billion each year in spending.
How much do tax cuts and spending raise GDP? The widely cited estimates of Mark Zandi of Economy.com indicate a multiplier of around 1.5 for spending, with widely varying estimates for tax cuts. Payroll tax cuts, which make up about half the Obama proposal, are pretty good, with a multiplier of 1.29; business tax cuts, which make up the rest, are much less effective....(Click for remainder).
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The New York Times
Bit by bit we’re getting information on the Obama stimulus plan, enough to start making back-of-the-envelope estimates of impact. The bottom line is this: we’re probably looking at a plan that will shave less than 2 percentage points off the average unemployment rate for the next two years, and possibly quite a lot less. This raises real concerns about whether the incoming administration is lowballing its plans in an attempt to get bipartisan consensus.
In the extended entry, a look at my calculations.
The starting point for this discussion is Okun’s Law, the relationship between changes in real GDP and changes in the unemployment rate. Estimates of the Okun’s Law coefficient range from 2 to 3. I’ll use 2, which is an optimistic estimate for current purposes: it says that you have to raise real GDP by 2 percent from what it would otherwise have been to reduce the unemployment rate 1 percentage point from what it would otherwise have been. Since GDP is roughly $15 trillion, this means that you have to raise GDP by $300 billion per year to reduce unemployment by 1 percentage point.
Now, what we’re hearing about the Obama plan is that it calls for $775 billion over two years, with $300 billion in tax cuts and the rest in spending. Call that $150 billion per year in tax cuts, $240 billion each year in spending.
How much do tax cuts and spending raise GDP? The widely cited estimates of Mark Zandi of Economy.com indicate a multiplier of around 1.5 for spending, with widely varying estimates for tax cuts. Payroll tax cuts, which make up about half the Obama proposal, are pretty good, with a multiplier of 1.29; business tax cuts, which make up the rest, are much less effective....(Click for remainder).
