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Reposted by Jonathan Hall

Institute for Replication @i4replication.bsky.social · 01/04/2026

🧵1/ Our first meta-science paper (with 350+ coauthors) is published today in Nature. It presents one of the largest-ever reproducibility projects in economics & political science. Here’s what we found 👇

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Lewis Lehe @lewislehe.bsky.social · 09/02/2026

Extended abstracts are due February 28th, to present in beautiful Bergamo, Italy @beriapaolo.bsky.social @jonathanhall.bsky.social Submit at www.itea2026.com #itea2026

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

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Paolo Beria 🇪🇺 @beriapaolo.bsky.social · 16/01/2026

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! t.co/RytjQvt3Ec #itea #bergamo

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http://www.itea2026.com

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Jonathan Hall @jonathanhall.bsky.social · 08/05/2025

Want to help a high school student with a homework assignment? Can you answer a five-question survey (related to college sports)? docs.google.com/forms/d/1TfB...

media.tenor.com

a man in a suit and tie says we did a survey on his face

ALT: a man in a suit and tie says we did a survey on his face

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Jonathan Hall @jonathanhall.bsky.social · 07/05/2025

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

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Jonathan Hall @jonathanhall.bsky.social · 07/05/2025

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

jhall.github.io

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Jonathan Hall @jonathanhall.bsky.social · 07/05/2025

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

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Jonathan Hall @jonathanhall.bsky.social · 07/05/2025

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

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Jonathan Hall @jonathanhall.bsky.social · 07/05/2025

Publication bias? Surprisingly little. 8/12

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Jonathan Hall @jonathanhall.bsky.social · 07/05/2025

📚🔍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

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Jonathan Hall @jonathanhall.bsky.social · 07/05/2025

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

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Jonathan Hall @jonathanhall.bsky.social · 07/05/2025

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

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Jonathan Hall @jonathanhall.bsky.social · 07/05/2025

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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Jonathan Hall @jonathanhall.bsky.social · 07/05/2025

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

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a group of men are walking down a street with the words where is my uber on the bottom

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Jonathan Hall @jonathanhall.bsky.social · 07/05/2025

🚨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

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Jonathan Hall @jonathanhall.bsky.social · 24/02/2025

🚨 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/...

transportation.northwestern.edu

June 23-27, 2025: Northwestern University Transportation Center - Northwestern University

ITEA Annual School and Conference

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Institute for Replication @i4replication.bsky.social · 22/01/2025

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!

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Jonathan Hall @jonathanhall.bsky.social · 16/01/2025

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!

transportation.northwestern.edu

June 23-27, 2025: Northwestern University Transportation Center - Northwestern University

ITEA Annual School and Conference

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NE Ohio Regional Sewer District @neorsd.org · 01/11/2023

please don’t flush wrappers to hide evidence after sneaking your kids’ candy tonight you know who you are

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Trade Diversion (Jonathan Dingel) @tradediversion.bsky.social · 24/10/2023

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

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Eliza Forsythe @elizaforsythe.bsky.social · 26/09/2023

Hear me out... a master login for editorial manager that works for all journals #EconSky

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Brendan Nyhan @brendannyhan.bsky.social · 26/09/2023

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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Jeffrey Lin @jeffrlin.bsky.social · 22/09/2023

🎙️🎙️🎙️ New Densely Speaking pod featuring Molly Brady with Greg Shill on private law, land use regulation, the outlook for zoning reform, and the Magic Mike cinematic universe. Spotify: spotify.link/ekbhofdLiDb Apple Podcasts: podcasts.apple.com/us/podcast/t...

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