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Jason Fletcher

@jasonmfletcher.bsky.social
2.4K followers 515 following 111 posts

Professor of Public Affairs at University of Wisconsin. Health Economics, Social Genomics, Networks. Views my own. fletcher.lafollette.wisc.edu substack.com/@jasonmfletcher

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Jason Fletcher @jasonmfletcher.bsky.social · 30/09/2026
Top economics research jumps over a low hurdle jasonmfletcher.substack.com/p/top-econom...
jasonmfletcher.substack.com
Top economics research jumps over a low hurdle
Too bad so much social science shields itself from similar evaluations
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Jason Fletcher @jasonmfletcher.bsky.social · 28/09/2026
A new focus of college education--creating experienced managers (of AI agents) jasonmfletcher.substack.com/p/a-new-focu...
jasonmfletcher.substack.com
A new focus of college education--creating experienced managers (of AI agents)
All colleges and universities are re-considering (“reimagining”) the essential skills we need to be teaching and how students can demonstrate expertise during their work-lives.
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Reposted by Jason Fletcher
ajhejournal.bsky.social @ajhejournal.bsky.social · 17/09/2026
What are the long-run health effects of abortion legalization? @hamidnb.bsky.social, Vu & @jasonmfletcher.bsky.social find cohorts in utero under legalized abortion regimes had 4.5% lower adult mortality and sizable reductions in disability. www.journals.uchicago.edu/doi/10.1086/744083 #EconSky
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Jason Fletcher @jasonmfletcher.bsky.social · 14/09/2026
AI can help us fix science by attacking the worst evidence jasonmfletcher.substack.com/p/ai-can-hel...
jasonmfletcher.substack.com
AI can help us fix science by attacking the worst evidence
But current rules and infrastructure are not ready
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Jason Fletcher @jasonmfletcher.bsky.social · 08/09/2026
Substack: How to transition from dissertation chapter to journal article jasonmfletcher.substack.com/p/how-to-tra...
jasonmfletcher.substack.com
How to transition from dissertation chapter to journal article
Another lightning strike---two teams working on the same question
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Reposted by Jason Fletcher
Brad DeLong @braddelong.bsky.social · 06/09/2026
Forty-three years a teacher, a role model who treated every economy as a system worth understanding whole, and a friend to me, always insisting you check all the boxes—and then go away, think harder, and circle back: **In Memory of Jeffrey Williamson: SATURDAY “SLOUCHING” & FRIENDS** Economic... 1/
braddelong.substack.com
In Memory of Jeffrey Williamson: SATURDAY “SLOUCHING” & FRIENDS
Economic history & related topics: The man who woke up eager, and the discipline of working as hard as you can to get the numbers right...
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Jason Fletcher @jasonmfletcher.bsky.social · 02/09/2026
Congratulations to @hamidnb.bsky.social on 1000+ google scholar cites; many more to come!
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Atheendar Venkataramani @atheendar.bsky.social · 01/09/2026
16 years after starting the project, 13 years after first submitting, it lives: www.journals.uchicago.edu/doi/10.1086/... It was a good experience. More on that later.
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Jason Fletcher @jasonmfletcher.bsky.social · 26/08/2026
Here are the 16 papers in the newest issue of Economics and Human Biology--see if you can find the pattern www.sciencedirect.com/journal/econ... In related news, happy to have a paper on early life effects of county health departments on longevity with @hamidnb.bsky.social
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Brendan Nyhan @brendannyhan.bsky.social · 26/08/2026
Many folks are replying to lament the loss of the paper. I agree we shouldn't give up on it! Google Docs version history + Pangram + submissions of multiple iterations of the paper + giving an exam on the paper is quite effective - see this syllabus, for example bpb-us-e1.wpmucdn.com/sites.dartmo...
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Jason Fletcher @jasonmfletcher.bsky.social · 04/08/2026
Are we really living in a gerontocracy? open.substack.com/pub/jasonmfl...
open.substack.com
Are we really living in a gerontocracy?
demography weighs in
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Jason Fletcher @jasonmfletcher.bsky.social · 03/08/2026
Placing bets: Statistical power is a key impediment to longevity research open.substack.com/pub/jasonmfl...
open.substack.com
Placing bets: Statistical power is a key impediment to longevity research
Andrew Gelman of course has a great blog/substack and has been talking about statistical power issues in the social sciences for a long time.
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Jason Fletcher @jasonmfletcher.bsky.social · 30/07/2026
Another AI use case: listening to useless presentations so you don't have to open.substack.com/pub/jasonmfl...
open.substack.com
Another AI use case: listening to useless presentations so you don't have to
I’m a good way through sketching out a book length treatment of the work I’ve been doing on longevity (esp with Hamid Noghanibehambari).
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Jason Fletcher @jasonmfletcher.bsky.social · 29/07/2026
How often do NBER Summer Institute organizers put their own papers on the program? open.substack.com/pub/jasonmfl...
open.substack.com
How often do NBER Summer Institute organizers put their own papers on the program?
Peter Hull asked, so...
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Jason Fletcher @jasonmfletcher.bsky.social · 29/07/2026
How to Write a Top 5 Paper: A Case Study open.substack.com/pub/jasonmfl...
open.substack.com
How to Write a Top 5 Paper: A Case Study
Two teams, nearly the same question, nearly the same data—and a revealing difference in what the papers ask the evidence to do
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Jason Fletcher @jasonmfletcher.bsky.social · 28/07/2026
It's not "verification" of AI-assisted research open.substack.com/pub/jasonmfl...
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Jason Fletcher @jasonmfletcher.bsky.social · 25/07/2026
Time to update our timeline of projects at americanmortalityproject.lafollette.wisc.edu Work on county health departments with @hamidnb.bsky.social Free access here: www.sciencedirect.com/science/arti...
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Jason Fletcher @jasonmfletcher.bsky.social · 25/07/2026
Now there is no excuse not to take advantage of one of the best public good elements of @nber.org, which is circulating so much free, great and timely economics research throughout the year. This webpage makes it even easier to locate work related to your interests. gideon-bornstein.com/si2026.html
gideon-bornstein.com
NBER Summer Institute 2026 — Video Library
A searchable library of the NBER Summer Institute 2026 recordings: jump straight to any talk's video and paper.
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Jason Fletcher @jasonmfletcher.bsky.social · 13/07/2026
Very happy to work with @nber.org to outline our research program (with @hamidnb.bsky.social), summarizing what we are learning about the impacts of early life circumstances on old age mortality and next steps.
nber.org
The Long Shadow of Early Life: Life Cycle Exposures and Old-Age Mortality
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Jason Fletcher @jasonmfletcher.bsky.social · 09/07/2026
AI-assisted research obliges us to be a new type of "Senior Author" open.substack.com/pub/jasonmfl...
open.substack.com
AI-assisted research obliges us to be a new type of "Senior Author"
This is a new role for many of us. We have some of the tools to do it, but must develop others
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Jason Fletcher @jasonmfletcher.bsky.social · 07/07/2026
Data Monopolists (part 2) open.substack.com/pub/jasonmfl...
open.substack.com
Data Monopolists (part 2)
monopolists everywhere, funded by NIH
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Jason Fletcher @jasonmfletcher.bsky.social · 26/06/2026
Mentoring Session Notes (Part 4): Tenure in unit vs. Tenure in profession, and Local vs. Global Maxima open.substack.com/pub/jasonmfl...
open.substack.com
Mentoring Session Notes (Part 4): Tenure in unit vs. Tenure in profession, and Local vs. Global Maxima
ASHEcon 2026 wrapped up in Minneapolis a couple weeks ago, and I thought I’d post a few of the main questions I heard in the early scholars mentoring sessions on Sunday.
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Jason Fletcher @jasonmfletcher.bsky.social · 25/06/2026
Monopoly (&) Power in Academic Publishing open.substack.com/pub/jasonmfl...
open.substack.com
Monopoly (&) Power in Academic Publishing
Under powered studies are a problem; a bigger problem is data monopolists.
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Jason Fletcher @jasonmfletcher.bsky.social · 24/06/2026
PhD student training in the age of AI: "Coach" vs "Lab" models open.substack.com/pub/jasonmfl...
open.substack.com
PhD student training in the age of AI: "Coach" vs "Lab" models
To the extent my views on AI assistance in research are distinctive among economists, one reason is that I have a history of running something closer to a lab of PhD students.
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Jason Fletcher @jasonmfletcher.bsky.social · 23/06/2026
Interesting stylized fact--the median US household gives < 2% of income to charity. I would have guessed closer to 10%. from: www.census.gov/content/dam/... But ChatGPT confirms: chatgpt.com/s/t_6a3af0e8...
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Reposted by Jason Fletcher
Minas Karamanis @minaskar.bsky.social · 30/03/2026
Hey, I wrote a thing about AI in astrophysics ergosphere.blog/posts/the-ma...
ergosphere.blog
The machines are fine. I'm worried about us.
On AI agents, grunt work, and the part of science that isn't replaceable.
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Jason Fletcher @jasonmfletcher.bsky.social · 18/06/2026
Mentoring Session Notes (Part 3): What Cover Letters Are Actually For open.substack.com/pub/jasonmfl...
open.substack.com
Mentoring Session Notes (Part 3): What Cover Letters Are Actually For
ASHEcon 2026 wrapped up in Minneapolis last week, and I thought I’d post a few of the main questions I heard in the early scholars mentoring sessions on Sunday.
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Jason Fletcher @jasonmfletcher.bsky.social · 16/06/2026
The Last Human in the Research Loop open.substack.com/pub/jasonmfl...
open.substack.com
The Last Human in the Research Loop
In this post, I consider the question of completely autonomous AI research.
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Jason Fletcher @jasonmfletcher.bsky.social · 15/06/2026
The First Domino: when should we blame AI for misleading us? open.substack.com/pub/jasonmfl...
open.substack.com
The First Domino: when should we blame AI for misleading us?
I’ve outlined an idea in the past about “blaming AI” for what really are “user errors”.
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Jason Fletcher @jasonmfletcher.bsky.social · 13/06/2026
Moving the goalposts when evaluating AI open.substack.com/pub/jasonmfl...
open.substack.com
Moving the goalposts when evaluating AI
Let's not abandon our evidentiary standards when asking important questions about AI impacts
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Reposted by Jason Fletcher
rgfrank.bsky.social @rgfrank.bsky.social · 12/06/2026
Sherry Glied and I have critiqued the recent analysis on the impact of Medicaid work requirements on poverty. It is linked here: : www.healthaffairs.org/content/fore... Unfortunately, Professors Mulligan and Bai who appear to have led the work get a failing grade on this one.
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Jason Fletcher @jasonmfletcher.bsky.social · 12/06/2026
AI agents are not (yet) your Coauthor. They are a Fleet of Weird RAs. open.substack.com/pub/jasonmfl...
open.substack.com
AI agents are not (yet) your Coauthor. They are a Fleet of Weird RAs.
The promise is cheap, fast, and many. The danger is a fire hose of plausible output that no one actually owns.
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Jason Fletcher @jasonmfletcher.bsky.social · 11/06/2026
Mentoring Session Notes (Part 2): Managing Research "Lanes" open.substack.com/pub/jasonmfl...
open.substack.com
Mentoring Session Notes (Part 2): Managing Research "Lanes"
TLDR: Don’t Let Mature Papers Sit on Your Desk and Rely on Mentors
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Jason Fletcher @jasonmfletcher.bsky.social · 10/06/2026
Mentoring Session Notes (Part 1): Planning for tenure letters open.substack.com/pub/jasonmfl...
open.substack.com
Mentoring Session Notes (Part 1): Planning for tenure letters
ASHEcon 2026 is wrapping up today in Minneapolis, and I thought I’d post a few of the main questions I heard in the early scholars mentoring sessions on Sunday.
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Reposted by Jason Fletcher
ajhejournal.bsky.social @ajhejournal.bsky.social · 29/05/2026
In Print! Can clean water in early life shape longevity decades later? Using water filtration programs in 25 cities, @hamidnb.bsky.social & @jasonmfletcher.bsky.social find that childhood exposure to filtered water increased male longevity by 3 months. www.journals.uchicago.edu/doi/10.1086/734081
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Atheendar Venkataramani @atheendar.bsky.social · 28/05/2026
1/ New #paper by Chuck Manski, @johnmullahy.bsky.social, and me in the Journal of Business and Economic Statistics (@amstatnews.bsky.social).
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Jason Fletcher @jasonmfletcher.bsky.social · 26/05/2026
Academic Talks: StoryTime or Instructional Video open.substack.com/pub/jasonmfl...
open.substack.com
Academic Talks: StoryTime or Instructional Video
Pick your poison
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Jason Fletcher @jasonmfletcher.bsky.social · 20/05/2026
Are disciplinary norms strong enough to constrain paper factories? open.substack.com/pub/jasonmfl...
open.substack.com
Are disciplinary norms strong enough to constrain paper factories?
Lots of thoughts on AI-automation and AI assistance in research, especially whether it will lead to paper factories and autonomous policy evaluation.
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Jason Fletcher @jasonmfletcher.bsky.social · 18/05/2026
AI-assisted research may reduce "policy-based evidence making" open.substack.com/pub/jasonmfl...
open.substack.com
AI-assisted research may reduce
A step in the Paper Factory model of semi-autonomous paper creation by Nathan Wilmers and Per Engzell caught my eye.
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Jason Fletcher @jasonmfletcher.bsky.social · 13/05/2026
AI Reasoning vs. AI Justification open.substack.com/pub/jasonmfl...
open.substack.com
AI Reasoning vs. AI Justification
I thought I’d note a few ideas that I observed in a CS class this spring.
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Jason Fletcher @jasonmfletcher.bsky.social · 12/05/2026
A Tale of Two Types of Programs: AI and Research Training open.substack.com/pub/jasonmfl...
open.substack.com
A Tale of Two Types of Programs: AI and Research Training
Why AI will reshape graduate training very differently across institutions
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Jason Fletcher @jasonmfletcher.bsky.social · 11/05/2026
AI-assisted research: shifts in quantity, quality, and other questions open.substack.com/pub/jasonmfl...
open.substack.com
AI-assisted research: shifts in quantity, quality, and other questions
A really useful session at NBER “Applications of Artificial Intelligence in Healthcare” led by Kosali Simon here:
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Jason Fletcher @jasonmfletcher.bsky.social · 05/05/2026
Macro and Micro: Will Demography have its own credibility revolution open.substack.com/pub/jasonmfl...
open.substack.com
Macro and Micro: Will Demography have its own credibility revolution
I’m getting ready to drive down to St Louis for the annual demographic conference (PAA) and thought I’d send out some notes I worked on last month about the split personality of demographic research.
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Jason Fletcher @jasonmfletcher.bsky.social · 02/05/2026
@johnmullahy.bsky.social
nybooks.com
‘The Music of What Happens’ | Nick Laird
Seamus Heaney’s complete poems, following on editions of his letters, prose, and translations, confirm the extent of his achievement.
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Jason Fletcher @jasonmfletcher.bsky.social · 02/05/2026
"The book reads like an Eat Pray Love of biotech grifting, designed to make her into a public figure based on her personal journey, now presented as the living impetus for her advocacy." lots of funny takes lareviewofbooks.org/article/orig... via @lareviewofbooks
lareviewofbooks.org
Natural Election | Los Angeles Review of Books
Kathryn Paige Harden’s new book offers a defense of a kind of Scientific Calvinism that converges with the eugenicist ideals of the contemporary Far Right.
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Jason Fletcher @jasonmfletcher.bsky.social · 29/04/2026
(not) learning from rejection open.substack.com/pub/jasonmfl...
open.substack.com
(not) learning from rejection
I think there is often a lot to learn from rejection— detailed comments from reviewers or editors who read your work carefully.
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Reposted by Jason Fletcher
Elizabeth Wrigley-Field @wrigleyfield.bsky.social · 28/04/2026
Look, Héctor Pifarré i Arolas, José Andrade, and @jasonmfletcher.bsky.social did the work of showing how wrong this was, instead of just saying "come on, that's definitely wrong" like I did. Their new study:
bmjopen.bmj.com
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Jason Fletcher @jasonmfletcher.bsky.social · 27/04/2026
Why do LLMs... open.substack.com/pub/jasonmfl...
open.substack.com
Why do LLMs...
There are major limitations in 'interpretability' of LLMs'
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