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Reposted by Jeff Gortmaker

Felix Montag @fmontag.bsky.social · Apr 15

Giulia Brancaccio and I are looking for a pre-doc to work with us on topics related to Industrial Organization and Trade
@nyu.edu

Ideally for two years starting in September

apply.interfolio.com/165860

#EconSky #EconRA

Apply - Interfolio {{$ctrl.$state.data.pageTitle}} - Apply - Interfolio

apply.interfolio.com

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Jeff Gortmaker @jeffgortmaker.com · Mar 12

Thanks Jeff!

Jeff Gortmaker @jeffgortmaker.com · Mar 8

Thanks!!

Jeff Gortmaker @jeffgortmaker.com · Mar 8

Thanks Jake :)

Jeff Gortmaker @jeffgortmaker.com · Mar 8

Likewise!!

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Jeff Gortmaker @jeffgortmaker.com · Mar 8

Thanks Steve!

Jeff Gortmaker @jeffgortmaker.com · Mar 7

My job market's done, and I'm heading back to the NYC area! Excited to join Princeton Econ as a postdoc next year and NYU Stern Econ as an AP in 2026.

In a happy twist of fate, this means @cconlon.bsky.social and I will be colleagues exactly 10 years after our first PyBLP commit:

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Reposted by Jeff Gortmaker

Jimbo Brand @jamesbrandecon.bsky.social · Jan 17

New paper with @adam-n-smith.bsky.social
papers.ssrn.com/sol3/papers....

Our paper develops a new approach for estimating demand nonparametrically while imposing economic constraints and comes with a new package, NPDemand.jl! Some things we do in the paper 1/

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Jeff Gortmaker @jeffgortmaker.com · Nov 29

8/6 Oh and for anyone interested in a thread on the actual paper, #EconSky wasn't as much of a thing last year but here's my twitter thread: twitter.com/jeff_gortmak...

Jeff Gortmaker on X: "Hey #econtwitter, I'm excited to share a new WP with @conlon_chris about micro data (e.g. consumer surveys) in BLP estimation. Alongside it, we finally released PyBLP version 1.0! Paper: https://t.co/iRJkHs9f6V Code: https://t.co/JPMbDOCEWA Docs: https://t.co/cjVhiFunxR 1/16 https://t.co/lBbr1iY1Sg" / X

Hey #econtwitter, I'm excited to share a new WP with @conlon_chris about micro data (e.g. consumer surveys) in BLP estimation. Alongside it, we finally released PyBLP version 1.0! Paper: https://t.co/iRJkHs9f6V Code: https://t.co/JPMbDOCEWA Docs: https://t.co/cjVhiFunxR 1/16 https://t.co/lBbr1iY1Sg

twitter.com

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Jeff Gortmaker @jeffgortmaker.com · Nov 29

7/6 Also: I'm on the job market! If you're interested in the economics of (industrial policy for) open source or want to see a (very simple) example of PyBLP-powered micro BLP in action, check out my job market paper: bsky.app/profile/jeff...

Jeff Gortmaker @jeffgortmaker.com · Nov 18

Hey #EconSky, I'm on the job market with an #EconJMP about open source software. OSS is a global public good, widely used and provided by the private sector, but the target of recent industrial policy.

Paper: jeffgortmaker.com/files/Open_S...

1/

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Jeff Gortmaker @jeffgortmaker.com · Nov 29

6/6 All this to say: if you're doing methods research, there are some clear private benefits that can come jointly with doing open source work (impact, transparency, networking, etc.) but also others that could be more surprising.

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Jeff Gortmaker @jeffgortmaker.com · Nov 29

5/6 Having an open source package lets you show students exactly how the method works with real-time examples. I used PyBLP to teach one of @causalinf.bsky.social @kylefbutts.bsky.social's Mixtape sessions (github.com/Mixtape-Sess...), which would have been far less accessible without it.

GitHub - Mixtape-Sessions/Demand-Estimation: Demand Estimation taught by Jeff Gortmaker and Ariel Pakes

Demand Estimation taught by Jeff Gortmaker and Ariel Pakes - Mixtape-Sessions/Demand-Estimation

github.com

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Jeff Gortmaker @jeffgortmaker.com · Nov 29

4/6 When others rely on your code, you write more tests, which can benefit your (future) self. For every PyBLP version, I run ~2k tests across ~50 functions. These made it easy to broaden the scope of our papers by adding new simulations and empirical examples with confidence.

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Jeff Gortmaker @jeffgortmaker.com · Nov 29

3/6 For micro BLP, I spent time iterating on PyBLP's interface to balance usability and flexibility. Feedback from users helped improve my design, which mapped directly into our standardized econometric framework, a key contribution of the 2nd paper.

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Jeff Gortmaker @jeffgortmaker.com · Nov 29

2/6 I expected PyBLP's issue tracker (github.com/jeffgortmake...) to be mostly bug reports, but most are questions. Our 2nd paper was motivated by these interactions, and many of our explanations were informed by discussions on the tracker and emails from less vocal users.

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Jeff Gortmaker @jeffgortmaker.com · Nov 29

Happy to share that my and @cconlon.bsky.social's micro BLP paper was just accepted at the Journal of Econometrics! jeffgortmaker.com/files/Incorp...

It's our 2nd tied to our PyBLP software, so here's a thread on surprising (to me) benefits of combining methods research with open source work. 1/6

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Reposted by Jeff Gortmaker

Suproteem Sarkar @suproteem.cc · Nov 20

Economic valuations fluctuate in ways empirical research cannot fully explain

What information are we missing? Economic theories emphasize the role of hard-to-quantify beliefs and perceptions

My job market paper develops algorithms + measurement to quantify perceptions of firms

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Reposted by Jeff Gortmaker

Shani Cohen @shanicn.bsky.social · Nov 20

I am on the job market, which seems like a great opportunity for my first post on here! My job market paper is about failures of contingent thinking -- the act of reasoning about hypothetical events. 1/

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Jeff Gortmaker @jeffgortmaker.com · Nov 20

I’m curious whether DeFi legality affects contributions. And time zone would for sure be a useful predictor! (It’s for sure at least somewhat predictive of country on GitHub.) Useful to hear that there’s probably no low hanging fruit for wallet geocoding - thanks.

Jeff Gortmaker @jeffgortmaker.com · Nov 19

Legality of geocoding wallets? Makes sense. Best public data I could find from a quick search is a coarse proxy involving web traffic (documents1.worldbank.org/curated/en/7...).

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Jeff Gortmaker @jeffgortmaker.com · Nov 19

Thanks, Gina! Given your research, I'm curious if you think some comparable spillover stats could be measured for crypto OSS at the country level? E.g., comparing crypto GitHub contributions by country to transaction volumes for geocode-able (?) wallets?

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Jeff Gortmaker @jeffgortmaker.com · Nov 18

Probably a lot of the questions are the same! A big thing that's changed is the increasing availability of incredible datasets like www.gharchive.org and innovationgraph.github.com

GH Archive

GH Archive is a project to record the public GitHub timeline, archive it, and make it easily accessible for further analysis.

www.gharchive.org

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Jeff Gortmaker @jeffgortmaker.com · Nov 18

thanks Shosh!

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Jeff Gortmaker @jeffgortmaker.com · Nov 18

18/18 This has been a joy to write and present (not only because I get to use PyBLP screenshots to illustrate US-China collaboration).

I'm excited to keep studying the tech sector from an IO perspective, and building econometric tools on the way.

Links: jeffgortmaker.com

Jeff Gortmaker

Jeff Gortmaker, Ph.D. candidate in Business Economics at Harvard University, specializing in industrial organization, with secondary interestes in econometrics and finance.

jeffgortmaker.com

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Jeff Gortmaker @jeffgortmaker.com · Nov 18

17/ Subsidies seem more effective and generate large innovation spillovers, especially if the US responds in kind.

Subsidies can be cheap because OSS investment is rare (weak private benefits), but impactful because OSS use is widespread (strong public benefits).

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