iiinova — where your digital self keeps evolving

Come join our department — two slots, looking for macro-labor, monetary, or international economists. Please share! econjobmarket.org/positions/12...

econjobmarket.org

EJM - Econ Job Market

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Peter Nencka 📊 @peternka.bsky.social · 17/09/2026

🚨 Announcing OpenCensus, a new project with @ezrakarger.bsky.social : We are transcribing the historical US censuses and releasing them as open data 2.6 million people so far in 1940, browse here: opencensus.us

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Review of Economics and Statistics (REStat) @restatjournal.bsky.social · 17/09/2026

FAIR plans meant to fix insurance redlining accidentally accelerated the urban decline they meant to prevent. Just Accepted new paper by Ingrid Gould Ellen, Daniel A. Hartley, Jeffrey Lin @jeffrlin.bsky.social and Wei You zurl.co/Gatdo

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Jeffrey Lin @jeffrlin.bsky.social · 08/09/2026

Yet on every world the same dense agglomeration: Lagos on our world, different names but the same place on others. Locational fundamentals reign!

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Jeffrey Lin @jeffrlin.bsky.social · 08/09/2026

Lots on AI alignment in here (running a multiversal polity takes a lot of compute!), but I was interested in views on determinism. Many millions of earth, outcomes ranged from climate crisis to advanced civilation to sentient rabbits!

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Jeffrey Lin @jeffrlin.bsky.social · 08/09/2026

Recently finished reading M.R. Carey’s Infinity Gate (2023) and Echo of Worlds (2024). Sci-fi multiverse where main character discovers inter-dimensional travel to millions of alternate Earths, many of which belong to federation known as the Pandominion.

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Jeffrey Lin @jeffrlin.bsky.social · 03/09/2026

What’s the value of a compact city? How would we know? Check out our latest Densely Speaking interview with the great Nina Harari 👇

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Greg Shill @gregshill.com · 04/09/2026

✈️ Traveling this weekend? I created a tool to make your airport time less annoying. Would love feedback. airportwtf.com

airportwtf.com

Airport WTF

Find food, coffee, bathrooms, and airport lounges near your gate at the 50 busiest U.S. airports.

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Jeffrey Lin @jeffrlin.bsky.social · 03/09/2026

What’s the value of a compact city? How would we know? Check out our latest Densely Speaking interview with the great Nina Harari 👇

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Juan Moreno-Cruz @jmorenocruz.bsky.social · 27/08/2026

I really love that paper. I’ve replicated it with my students.

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Greg Shill @gregshill.com · 27/08/2026

🚨 New Densely Speaking pod! @jeffrlin.bsky.social and I interview Wharton economist Mariaflavia Harari, author of "Cities in Bad Shape: Urban Geometry in India." I learned so much from this very fun conversation. Spotify: open.spotify.com/episode/6TgG... Apple: podcasts.apple.com/us/podcast/c...

open.spotify.com

S5E2 - Cities in Bad Shape: Urban Geometry in India (Mariaflavia Harari)

Densely Speaking · Episode

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YIMBYonese Liberation Army @dingbattitude.bsky.social · 25/08/2026

I think you have to believe that in a kafkaesque way, an existing urban freeway is impossible to tear down while it stands, and impossible to rebuild after it collapses.

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Jeffrey Lin @jeffrlin.bsky.social · 20/08/2026

Congrats and best wishes on your next steps, Zak!

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Chris Severen @chrisseveren.bsky.social · 14/08/2026

@foxecon.bsky.social and and I organize some urban + spatial talks at the SEAs :: Simon's put together a page of current and prior programs 🔗 sfuchs-de.github.io/sea-spatial/

sfuchs-de.github.io

Junior Spatial at the SEA

Junior Spatial: organized sessions in spatial, urban, transport, and trade economics at the Southern Economic Association Annual Meeting.

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Jeffrey Lin @jeffrlin.bsky.social · 04/08/2026

Our new paper has an explanation for both slowing TFP growth and increasing R&D that is consistent with the Fort et al interpretation that the links between a firm’s R&D and *other* firms’ productivity has weakened.

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Jeffrey Lin @jeffrlin.bsky.social · 05/08/2026

🛣️ 🌆 How do the quality of life costs of highways vary across cities? In a new review article (forthcoming at RSUE), Brinkman and I expand our Freeway Revolts methodology across US metropolitan areas.

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Jeffrey Lin @jeffrlin.bsky.social · 04/08/2026

To understand rising R&D, the key move is to see that new ideas might be infinitely reusable (nonrival, cf Romer) but in practice each idea is only “locally” useful. A new tractor design benefits a farmer, but a consultant would benefit more from a new spreadsheet.

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Kohei Takeda @koheitakeda.bsky.social · 07/08/2026

Now available online and open access: The Economic Dynamics of City Structure: Evidence from Hiroshima's Recovery | Journal of Political Economy: Vol 0, No ja www.journals.uchicago.edu/doi/10.1086/...

journals.uchicago.edu

The Economic Dynamics of City Structure: Evidence from Hiroshima's Recovery | Journal of Political Economy: Vol 0, No ja

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Jeffrey Lin @jeffrlin.bsky.social · 05/08/2026

Ungated version here: jlin.org/papers/BL-CO...

jlin.org

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Jeffrey Lin @jeffrlin.bsky.social · 05/08/2026

Cities with larger disamenities grew more slowly, conditioned on measures of total freeways and initial population. Our results suggest that the growth effects of highways reflect a composite of access benefits and quality-of-life costs.

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Jeffrey Lin @jeffrlin.bsky.social · 05/08/2026

In this article, we focus on the cross-city evidence. Freeway disamenities are larger where highway networks intersect dense residential neighborhoods. The degree of that intersection reflects the joint configuration of cities and their highway networks.

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Jeffrey Lin @jeffrlin.bsky.social · 05/08/2026

The core insight of our prior work is that highways affect welfare through two margins: improving regional accessibility but reducing local quality of life through noise, pollution, barrier effects. The net effect on neighborhoods and cities is the combination of access benefits and amenity costs.

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Jeffrey Lin @jeffrlin.bsky.social · 05/08/2026

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Jeffrey Lin @jeffrlin.bsky.social · 04/08/2026

Thread here! bsky.app/profile/jeff...

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Jeffrey Lin @jeffrlin.bsky.social · 04/08/2026

This localization of innovation benefits means that TFP growth scales with the *average* new idea but R&D costs scale with the *sum* of all projects across the economy. Hence R&D productivity declines.

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Jeffrey Lin @jeffrlin.bsky.social · 04/08/2026

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Jeffrey Lin @jeffrlin.bsky.social · 04/08/2026

As the knowledge frontier expands, inventors build bigger and more differentiated new ideas in order to recoup the rising burden of knowledge. This “spreading out” weakens knowledge spillovers, slowing growth.

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Jeffrey Lin @jeffrlin.bsky.social · 04/08/2026

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Jeffrey Lin @jeffrlin.bsky.social · 30/07/2026

ICYMI, our new paper on inventor positioning in the space of ideas and what it might mean for growth. Thread here bsky.app/profile/jeff...

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Julian Reif @julianreif.bsky.social · 29/07/2026

“Two teams can find nearly the same fact. The paper with the higher general-interest ceiling may not have a dramatically more credible estimate. It may instead ask the estimate to do more.”

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NBER @nber.org · 25/07/2026

Analysis of 11 million US patents shows inventions have spread out in idea space since 1836, helping explain weaker spillovers and lower research productivity, from Ina Ganguli, Jeffrey Lin, Vitaly Meursault, and Nicholas F. Reynolds www.nber.org/papers/w35499