Jonathan Hall

advertisement for the international transportation economics association annual school and conference. in Bergamo Italy

Extended abstracts are due February 28th, to present in beautiful Bergamo, Italy @beriapaolo.bsky.social @jonathanhall.bsky.social
Submit at www.itea2026.com
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Join us at the International Transportation Economics Association Annual Conference & School at the University of Bergamo, Italy, June 15-19, 2026! Submit your transportation economics research by Feb 28. Two paper prizes available!

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Want to help a high school student with a homework assignment? Can you answer a five-question survey (related to college sports)?

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P.S. Those in literature may like our summaries of the 56 papers we found. 12/12

🔗Find the full paper at jhall.github.io/documents/Va... 11/12

Takeaway #2: Average effects are small. General statements about the impact of ride-hailing on transit ridership, traffic congestion, and traffic fatalities should reflect that the average estimate is close to zero and not statistically significant. 10/12

Takeaway #1: Context matters. Dense NY or London ≠ mid‑sized Vancouver. But for many US/Canadian metros, long‑run ride‑hailing impacts on transit & congestion are likely modest. 9/12

Publication bias? Surprisingly little. 8/12

📚🔍To put these results in context, we then conducted a meta-analysis. We screened 2,597 papers, kept 56. Across modes & countries, lots of heterogeneity, but average estimates hover near zero; ~⅓ of papers find no significant effect (but boosts🚊and depresses 🚍). 7/12

⚠️Traffic fatalities: noisy data give wide CI [‑30%, +199%]. We can’t rule much in or out. 6/12

🚗Traffic congestion: point estimates slightly ↑ but never statistically significant; CI [‑6.1%, +20.7%]. No evidence that “Uber makes gridlock explode” 5/12

We use a weighted average of US/CA cities to build a synthetic Vancouver that has Uber to estimate how ride-hailing impacts transit ridership, traffic congestion, and traffic fatalities. What do we find? 3/12

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In 2012 B.C.’s regulator blocked Uber, labeling it a “$75‑minimum limo.” For 7 years Vancouver was a big North‑American city with no ride‑hailing—an economist’s natural experiment. 2/12

🚨New paper!🚨In “VancUber: The Long‑Run Effect of Ride‑hailing on Public Transportation, Congestion, and Traffic Fatalities” (forthcoming @ CJE), Craig Palsson, John Cairncross, and I use Vancouver’s ban on Uber/Lyft until 2020 to ask “what if ride‑hailing never came?” 1/12

June 23-27, 2025: Northwestern University Transportation Center - Northwestern University ITEA Annual School and Conference

🚨 FINAL REMINDER: Submit your abstract for ITEA 2025 by Feb 28! Join top transportation economists at Northwestern this June for the conference (June 25-27) and annual school (June 23-25). Keynote by MIT's Dave Donaldson. Student discounts available! transportation.northwestern.edu/news-events/...

New research alert! Our study investigates the effectiveness of human-only, AI-assisted, and AI-led teams in assessing the reproducibility of quantitative social science research. We've got some surprising findings!

June 23-27, 2025: Northwestern University Transportation Center - Northwestern University ITEA Annual School and Conference

Join us at the International Transportation Economics Association Annual Conference & School at Northwestern University, June 23-27, 2025! Featuring keynote speaker Prof. Dave Donaldson (MIT). Submit your transportation economics research by Feb 28. Two paper prizes available!

🚨 New paper! 🚨

Should Cities Tax Uber and Lyft? 

Thread below, and link to the WP here: 
papers.ssrn.com/sol3/papers....

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PhD students: If you will be on the 2024-2025 job market, build your website now.

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Social scientist colleagues - more invite code donations welcome! Please send in text format via email or by DM at @brendannyhan at the old place. I've redistributed ~150+ thanks to many generous donations but I'm currently down to 4 codes.

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