Hillary Clinton says that “we are dramatically underinvesting” in infrastructure and she promises a large increase in federal spending. Donald Trump is promising to spend twice as much as Clinton. Prominent wonks such as Larry Summers are promoting higher spending as well. But more federal spending is the wrong way to go.
To shed light on the issue, let’s look at some data. There is no hard definition of “infrastructure,” but one broad measure is gross fixed investment in the BEA national accounts.
The figure below shows data from BEA tables 1.5.5 and 5.9.5 on gross investment in 2015. The first thing to note is that private investment at about $3 trillion was six times larger than combined federal, state, and local government nondefense investment of $472 billion. Private investment in pipelines, broadband, refineries, factories, cell towers, and other items greatly exceeds government investment in schools, highways, prisons, and the like.
One implication is that if policymakers want to boost infrastructure spending, they should reduce barriers to private investment. Cutting the corporate income tax rate, for example, would increase net returns to private infrastructure and spur greater investment across many industries.