Does more highway spending raise long-term economic growth?
Core argument: San Francisco Fed research finds that the economic benefits of highway spending are typically confined to recession periods and do not persist beyond 10 years, with short-term construction-phase boosts dissipating after projects are completed.
Despite bipartisan support for increased highway spending, research indicates that major new investment in U.S. roads is unlikely to yield long-term economic gains. The U.S. already has an extensive road network, so additional construction would not significantly enhance productivity or GDP growth. While short-term economic boosts may occur during construction phases, these effects dissipate post-completion. Studies, including those by the San Francisco Fed, show that any immediate benefits are typically confined to recession periods and do not extend beyond 10 years. Furthermore, infrastructure improvements often lead to "induced demand," where increased road capacity results in proportional traffic growth, negating congestion relief. In developed countries like the U.S., new road investments tend to redistribute economic activity rather than expand it, offering limited net growth effects.























Ben Comment:Digging in just a little, the author’s say "The top three of these are “mobile devices,” “machine learning,” and “cloud computing.””These are all very recent developments but the paper purports to go back to 1976. Maybe there weren’t as many “disruptive” technologies between 1976 and the late ‘90s (first cell phones) and then not many between the ‘90s and 2010s (machine learning and cloud computing).But that seems thin to me. Do you agree? They go on:"Taken together, 22% of all patents granted by the U.S. Patent and Trademark Office (USPTO) between 1992 and 2016 are involved with the development of at least one of our 29 technologies.” They call this big but I think it looks really small.The data also uses online job postings which means they really only have jobs data starting in 2014 - regardless of what they claim historically. Finally - this would be a question for Ed - what does it take for a technology to actually make its way into an earning’s call? I have no idea. I don’t really believe the paper does much and I wouldn’t want it to be the main support of an important argument, but you did a good job pulling the results. Basically I think the data work they do and the data sets available to them aren’t all that convincing.