Assistant Professor of Economics (@barnardecon) at @BarnardCollege of @columbia. Interested in crime & criminal justice through the prism of racial inequality.

The Bronx, NY
Joined December 2012
Really excited to share that both my better half (@bfoxwilliams) and I were selected as 2024-25 @RussellSageFdn Visiting Scholars. Looking forward to joining such an impressive group of scholars.
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Morgan C Williams Jr retweeted
Was about to write this but Ben beat me to it. Econ is unique among the sciences in that it is several pretty different fields living under one umbrella. Empirical econ is the biggest subfield and its closest to biology or chemistry: it’s about designing or—even better—finding a natural experiment, or documenting interesting and important patterns in data. Most of the arguments in that field are about methods, eg do you have identification. More and more are starting to study AI now but obviously this won’t be transformative AI because, well, there is no data on transformative AI. Then there are macro economists. They work with a set of pretty standard models and mainly expand them by slowly adding/subtracting different sectors or micro founding factors of production in different ways. Many of the arguments are on the parameter values that we should assume when simulating the economy. Early research on transformative AI started there—as demonstrated recently by Chad, Anton et al, the different levels of transformation are due to different assumptions on parameters rather than some new type of economics. The same model can predict basically no impact of AI vs huge transformation, it’s all about assumptions on parameters. Finally there is micro theory. This is where decision theory, game theory, mech design, org econ (sort of) live. This field works by setting out a set of assumptions and then *deriving* the expected results; alternatively one could start with a result and work backwards to derive the necessary and sufficient assumptions. There is a ton of potential here to do work on transformative AI: start with assumptions on how AI differs than human agents (eg relax basic assumptions on constraints, on scarcity, introduce completely different objective functions), then derive implications. But this is where there is the least amount of work, and it’s important for that to change (and I believe that it already is). I think we can make a ton of progress from these three subfields on better understanding the potential AGI and post AGI transformation. But there is another scenario, post strong ASI, where I don’t think economics has much to say about. Here I agree with @Jabaluck that the economy (if you can even call it that) and the agents in it will be so vastly different and beyond our imagination that I wouldn’t know where to start modeling it. Not to discourage others, but post singularity seems like pure epistemic uncertainty to me. A lot of the critiques I hear about AI and economics come from people who don’t quite get what economists do. They look around at different results and if they don’t like some of them, they say “oh economics isn’t “pilled” or something. But economists don’t debate results, they *derive* results from assumptions. Thats where the debate is. Saying “but you don’t understand a world with 15 billion AI agents”. What does that mean for the economy? What are those agents doing, who is buying what they are producing, what do property rights look like? Depending on those assumptions you’ll get vastly different economic scenarios, from 2% growth and high human labor share to completely alien centralized systems with no prices or markets.
This misdiagnoses things in a few different ways - let me try to unpack. (1) A lot of the 10x new economists of AI are empirical. Truly empirical econ is modest and backward-looking. (2) What you want is new theory - that's where big new approaches will live/come from. 1/
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Morgan C Williams Jr retweeted
A modest proposal for overhauling the review process in economics in light of AI. Three steps: 1. A substantial number of human referees (~5?) read the paper and prepare a short (~2 paragraph max) assessment of the overall importance and any glaring concerns. These are returned quickly, e.g. within 2-3 weeks 2. The editor decides from the paragraphs whether to send the paper out to a single expert reviewer. Otherwise, desk reject 3. A single human expert works with an open-source AI reviewer to prepare a detailed report, drawing on the initial paragraphs as helpful. This gets sent to the editor who decides R&R/reject (after potentially also consulting the AI) The idea is to get a larger sample of opinions for the initial filter, and reduce intense human reviewing time to make the overall process quicker. Single-reviewer assignment may also improve incentives / responsiveness and avoid divergent recommendations for review. Plus, a desk reject would always come with many short reports for future improvement. Just one idea
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Morgan C Williams Jr retweeted
Dear followers, please see this Substack from @MITshapingwork about my research with Andrea Manera and Pascual Retrepo on the US tax code's bias toward automation. How the US tax code incentivizes companies to replace workers with AI
The US tax system is biased against workers in favor of machines and algorithms, and has become more so in recent years. Our latest Substack post unpacks research from @DAcemogluMIT and co-authors: mitstonecenter.substack.com/…
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Morgan C Williams Jr retweeted
New Substack post with @soumitrashukla9. Work has never been just about the income earned sans effort costs, as typical in economic models. Key aspects of people’s identity, their meaning, and sense of agency are all wrapped up with what they do for a living. There has been a lot of conversation lately about how technological change, particularly AI, may disrupt this relationship, from Ezra Klein's column on his own mathematician father’s grapplings with losing meaning in mathematics, to Francis Fukuyama's post on AI, agency, and recognition. In this piece we take a historical perspective on how technological transformation has disrupted identity and meaning by affecting jobs, and how workers and society responded to these changes. Much of the debate around AI and jobs has centered on wages and material consequences, but losing one's work is also intertwined with how people view their place in society. Most people know about the Luddites—skilled weavers and knitters—who protested the devaluation of their mastery. What’s less known is that the Luddites were actually experts in using the machines as well, and that their protests prompted prominent economists like David Ricardo to rethink the role of automation in society, and later inspired the Arts and Crafts movement. A century later, when recorded sound displaced 20,000 cinema musicians, their campaign against "canned music" and two-year recording ban pressured labels into funding live performance. Soumitra and I have been working on versions of this essay for months. He led the piece, and we’re both really excited to get it out there. Link to the post here: aleximas.substack.com/p/tech…
The most revealing part of this conversation between Jon Stewart and Jacob Coxon wasn't Coxon's warning about A.I. doom, but his description of A.I. utopia, and Stewart's incredulous response. I wrote about it — and Francis Fukuyama's "Last Man," and A.I. easily solving the problems that bedeviled my father's field of mathematics for decades — here: nytimes.com/2026/10/18/opini…
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Morgan C Williams Jr retweeted
Michela Tincani @MichelaTincani has written a tour de force study of peer effects in education. The effects of the massive 2010 Chilean earthquake are used to (with really lovely arguments) to identify family, school, and peer channels to educational attainment. The analysis of peer effects leads to evidence on the importance of competition on student achievement. This leads to an important conclusion: tracking can improve outcomes for all students via its influence on the ability to successfully compete with peers. As such, this finding challenge the ways that complementarity and substitution effects are conventionally modelled. A great paper!
Humbled to see my paper selected as the lead article in the latest issue of the Journal of Political Economy @JPolEcon. journals.uchicago.edu/toc/jp…
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📢 Submit your research to the Society of Labor Economists’ 30th Annual Meeting! Join colleagues April 30–May 1, 2027, in Baltimore, MD. Complete papers are required for full and poster sessions. Deadline: October 31, 2026 buff.ly/1YWVWxk
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Morgan C Williams Jr retweeted
Very interesting paper on causal effects of social media on polarization based on a randomized experiment during a presidential debate. Finding: near zero or opposite effects! Caveat (?): can short-run one-shot intervention work if social media effect is cumulative and set in?
Very happy to share that our paper with Rafael Di Tella and Ramiro Gálvez (@RamiroHGalvez) has recently landed in JEBO! In this paper, we study whether varying access to Twitter/X during a presidential debate affects political polarization.
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Morgan C Williams Jr retweeted
Do loan officers discriminate against women entrepreneurs? In a paper with @ketkidsheth & @ShibiruAyalew just published in @restatjournal, we use a field experiment in a large-scale, high-stakes natural context to show that they do not.
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Morgan C Williams Jr retweeted
Job market candidates in labor: we invite you to join the Labor Hub, create a profile and post your JM paper! You need the endorsement of your advisor, that’s all. laborhub.ilr.cornell.edu
Big announcement to the Labor Econ Community: We have created the "Labor Hub" - a platform to exchange relevant info (events, jobs, visits, SI, papers...) - Apply to become a member! Job market candidates especially encouraged to apply! Link: laborhub.ilr.cornell.edu/ Please share!
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Morgan C Williams Jr retweeted
We invite applications for a postdoctoral position in applied microeconomics under the supervision of Professor Manasi Deshpande. The anticipated start is Autumn 2027. Learn more and apply: economics.uchicago.edu/sites… EOE/Vet/Disability #EconJobMarket #AppliedMicro #AcademicJobs
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Morgan C Williams Jr retweeted
Did you know that the ROI calculations done by orgs like @GiveWell and @coeff_giving do not include externalities like this? This is a big problem! Reducing violent crime is extremely high ROI, in large part because of these externalities.
Violent crime is a first-order threat to economic growth in the developing world. One example: the threat of violent crime affects whether women take up job training. "Glass Walls: Experimental Evidence on Constraints Faced by Women in Accessing Valuable Skilling Opportunities" by Cheema, Khwaja, Naseer, and Shapiro. Recently published in JPE.
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Genuine Question: For people using Pangram to detect AI usage in academic research and other related tasks, what thresholds, heuristics, etc. are you employing to ultimately make decisions regarding the “authenticity” of the work in question?
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Morgan C Williams Jr retweeted
I keep seeing people run all sorts of documents through Pangram and get outraged when they come back as AI-positive. I feel like I’m starting to lose sight of what we’re trying to achieve here. Is the outrage always warranted? 1/
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Morgan C Williams Jr retweeted
I’m hiring a Predoctoral Research Associate at @Brown_Economics! Come help me study how schools and teachers shape the long-run economic success of young people. Priority deadline: Oct. 31. DMs welcome. apply.interfolio.com/191110 Please share! #econ_ra #predoc
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Morgan C Williams Jr retweeted
The 8th annual Texas Economics of Crime Workshop (TxECW) will be held in Austin on April 16-17, 2027 Organized once again by @DrJPCunningham, Cody Tuttle, and me Deadline: Dec 7, 2026 Link to submit: bit.ly/TxECW2027 ✨Looking forward to seeing your papers! ✨
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Morgan C Williams Jr retweeted
If you're on the job market in IO or know someone who is, add your name to the list (or pass on the link). Ppl on the 'demand' side of the market tell me they look at this list both during the market (e.g. for hiring) and after (e.g. for inviting to seminars, etc.).
The running list of IO job market candidates for 2026-2027 is live! Fill this out to add your info if you are an econ job market candidate in industrial organization this year: forms.gle/kSRAxu8NAFsJ1AXB6 Running list here: shoshanavasserman.com/io-jmc…
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Morgan C Williams Jr retweeted
Work for us as a full-time Research Professional in health economics! Opportunities available in Chicago through both @nberpubs and @UChicago @BeckerFriedman. Apply below / please share: workforcenow.adp.com/mascsr/… job-boards.greenhouse.io/bfi…
New pre-doc opening with @GottliebEcon, Maggie Shi, @zarekcb, and @ProfNoto at @BeckerFriedman Learn more at bit.ly/45CKBwU
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📢 We're hiring! BFI and @UChiEnergy are seeking a full-time Research Professional to work with Professor Koichiro Ito on energy and environmental policy research across the US and internationally. 📍 Chicago, IL 📅 Start: Summer 2027 Apply now: job-boards.greenhouse.io/uch…
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Morgan C Williams Jr retweeted
I have an announcement, folks! I'm on the Selection Committee for a new, $1 million academic prize. The Carob Trust Prize for Academic Courage will support scholars whose work is original, rigorous, impactful, and courageous — even when it's unpopular. thecarobtrust.org/the-prize
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