Robert J. Barro, an economics professor at Harvard University and a senior fellow at Stanford University’s Hoover Institution, has an excellent commentary in The Wall Street Journal. This piece explains the problems with the multiplier that backers of government stimulus programs count on to make the government spending work. Here’s an excerpt:
Back in the 1980s, many commentators ridiculed as voodoo economics the extreme supply-side view that across-the-board cuts in income-tax rates might raise overall tax revenues. Now we have the extreme demand-side view that the so-called “multiplier” effect of government spending on economic output is greater than one — Team Obama is reportedly using a number around 1.5.
To think about what this means, first assume that the multiplier was 1.0. In this case, an increase by one unit in government purchases and, thereby, in the aggregate demand for goods would lead to an increase by one unit in real gross domestic product (GDP). Thus, the added public goods are essentially free to society. If the government buys another airplane or bridge, the economy’s total output expands by enough to create the airplane or bridge without requiring a cut in anyone’s consumption or investment.
The explanation for this magic is that idle resources — unemployed labor and capital — are put to work to produce the added goods and services.
If the multiplier is greater than 1.0, as is apparently assumed by Team Obama, the process is even more wonderful. In this case, real GDP rises by more than the increase in government purchases. Thus, in addition to the free airplane or bridge, we also have more goods and services left over to raise private consumption or investment. In this scenario, the added government spending is a good idea even if the bridge goes to nowhere, or if public employees are just filling useless holes. Of course, if this mechanism is genuine, one might ask why the government should stop with only $1 trillion of added purchases.
The full article is Government Spending Is No Free Lunch .