"One big caveat to the argument for infrastructure spending is that it usually takes a long time to plan such projects. Hence, it is not clear when the spending for such projects would actually occur, and hence the stimulus to the economy (this is called an outside policy lag, in the jargon). The "one-year horizon" shown in the table is for the horizon of one year from beginning of spending, not the beginning of planning and appropriation.
I have two observations here. First, if the spending could be directed to the states which had construction about to start, but hindered by financing or state revenue issues, then the problem of timing could be partly mitigated. I admit that it is unlikely that there are a tremendous number of such projects (although I am happy to be corrected). That leads me to my second observation.
The CBO study Options for Responding to Short-Term Economic Weakness (January 2008) laid out three principles for effective stimulus, loosely characterized as "timely, targetted, and temporary". "Read the rest.
Of course, the main point is simply to get the projects started and paying wages and paying for materials, for example.
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