Infrastructure Costs
- Date Posted:
- Is Database:
- Database
The cost of building one mile of interstate highway in 1980 was 3x the cost in 1960, adjusted for inflation. @LeahBrooks, Brookings Institution.
Research (preliminary) from Brookings using FHA data finds that the cost of building one mile of interstate highway in the 1980s was three times what it cost in the 1960s, adjusted for inflation.
".... There is widespread consensus that US infrastructure investment - and infrastructure quality - has been on the decline. In response, politicians across the ideological spectrum have called for increased infrastructure spending. How much infrastructure we would get depends on how much output is produced per dollar of spending. Yet we know surprisingly little about infrastructure costs across time and place. We help to fill this gap by using data we digitized on the Interstate highway system—one of the nation’s most valuable infrastructure assets—to document spending per mile over the history of its construction. We make two main contributions. First, we find that spending per mile on Interstate construction increased more than three-fold (in real terms) from the 1960s to the 1980s. We date the inflection point of increase to the early 1970s. We further show that neither changes in the observed geography of spending nor increases in material and labor prices explain these changes. Second, we provide suggestive evidence of the determinants of the increase in spending per mile. In particular, the increased spending per mile coincides with the rise of “citizen voice” in government decision-making in the early 1970s. And rising incomes and housing prices nearly completely statistically explain the increase in costs.We also largely rule out several common explanations for rising costs, such as increases in per-unit labor or materials prices.....The first is that the demand for more expensive Interstate highways increases with income, as either richer people are willing to pay for more expensive highways or in any case they can have their interests heard in the political process. The doubling in real median per capita income over the period accounts for roughly half of the increase in expenditures per mile over the period. Also consistent with this, and with the finding that the increased costs are due to increased inputs, not per unit input prices, we show that states construct more ancillary structures, such as bridges and ramps, and more wiggly routes in later years of the program. Controls for home value also account for a large proportion of the temporal increase; taken together, income and home value increases account for almost all the temporal change in costs..."
Leah Brooks and Zachary Liscow, "Infrastructure Costs," Brookings Institution, July 2019, https://www.brookings.edu/wp-content/uploads/2019/07/2019-07-12_infrastructure_costs_v2.pdf










Ed Comment: So typical. At Bain, we called this pushing on a balloon. Things are more likely to move around than to increase or decrease. Unfortunately, the public sector is largely unsupervised and poorly supervised when it is. Tough/effective supervision makes sure you’re not just pushing on a balloon.