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November 30, 2015
Every $1 in infrastructure spending boosts the economy $2
Posted On: Dec 03, 2012
A recently published working paper from the San Francisco Fed shows that the fiscal multiplier of infrastructure spending is much larger than the typical government spending multiplier.

Sylvain Leduc and Daniel Wilson studied the effect of unexpected infrastructure grants on state GDPs (GSPs) since 1990 and found that, on average, each dollar of infrastructure spending increases the GSP by at least two dollars. Valerie Ramey, Professor of Economics at UC San Diego and member of the National Bureau of Economic Research, reports that the typical fiscal multiplier is between 0.5 and 1.5.

Leduc and Wilson note that their results serve as a validation of Keynesian economics:

We find that unanticipated increases in highway spending have positive but temporary effects on GSP, both in the short and medium run. The short-run effect is consistent with a traditional Keynesian channel in which output increases because of a rise in aggregate demand, combined with slow-to-adjust prices. In contrast, the positive response of GSP over the medium run is in line with a supply-side effect due to an increase in the economy’s productive capacity.

What’s more, their study showed that the multiplier increases during a downturn. Leduc and Wilson found that the multiplier in the wake of the 2009 stimulus was “roughly four times” more than average. That means infrastructure investments offer more value during busts than booms, which should encourage policymakers attempting to counteract high unemployment in the construction sector by increasing spending on highways, roads, and bridges.

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