Matt Grennan

Professor @Emory researching health economics, especially innovation, pricing, and adoption of medical technology

[Zlatan Ibrahimović @Ibra_official]

The studio will never forget

[Matthew Leisten @LeistenEcon]

📢The @FTC is hiring economists! JMCs with US citizenship and an interest in balancing policy work in consumer protection and antitrust with research in applied micro, IO, and micro theory should apply!!

DM me for more info if you want!

Here's a link: https://t.co/7lJPAxj0aR

[Pier Paolo Creanza @ppcreanza]

🚀I am on the #EconJobMarket!

My JMP asks a classic question:
Do large, dominant firms foster or hinder innovation?

To study this, I turn to the Great Merger Wave (1895–1904), when >2,600 U.S. firms combined into corporate giants like U.S. Steel and DuPont.

A JMP 🧵👇 (1/13)

[Paul Novosad @paulnovosad]

Another great thing about econ seminars is that it's where you can observe how people actually think about and evaluate research — it's the hidden curriculum revealed.

If you only read the published and working papers, it is very hard to learn how researchers actually think.

[Arpit Gupta @arpitrage]

Another Haidt win — mobile phone app use is contagious and lowers GPAs and wages.

Evidence from roommate randomization and China gaming ban, in the QJE.

[Matt Grennan @matthewgrennan]

“Bankshot reasoning” is a great term, and these types of over-thinking need a term … still mulling whether the shoe fits but the parts are great in any case!

[Arpit Gupta @arpitrage]

I am formally coining the term “bankshot reasoning” for convoluted or hyper rational chains of logic which elevate second order effects.

Ie “if we give people masks, they behave more risky and infection risk rises”

“If we ban Tylenol, pregnant women will take more out of spite”

[John A. List @Econ_4_Everyone]

Referees are the backbone of the academic journal system. Their selfless commitment of time and expertise ensures that our science continues to advance with rigor and integrity. Often, they stand in the line of fire—bearing the brunt of an author's frustration or disappointment—yet they persist with professionalism and care.

To all the outstanding referees out there: please know that editors deeply appreciate your hard work and tireless dedication.

We may not say it often enough, but your contributions do not go unnoticed. Thank you.

[Matt Grennan @matthewgrennan]

@conlon_chris @BrianCAlbrecht Gristedes—walked in once my first few weeks in nyc and never went back. Don’t think I can say anything similar about another retailer in my lifetime

[Matt Grennan @matthewgrennan]

@ErikHovenkamp @LeeHepner I am sure this must depend on specifics of demand, but my intuition was that the vakue added of the smaller buyer decreases, which lowers its leverage in bargaining.

[Matt Grennan @matthewgrennan]

@ErikHovenkamp @LeeHepner One that resonated with me was with negotiated prices, small retailer value to the supplier can decrease because it is now competing with lower price rival downstream. Not clear if that makes consumers worse off though

[Matt Grennan @matthewgrennan]

@ErikHovenkamp @LeeHepner Better counter examples in Inderst several papers on this “water bed effect”. Not sure we know the empirical relevance of the various conditions under which this can occur.

[Matt Grennan @matthewgrennan]

@nberpubs said it well and concisely. Anticompetitive theories of harm from “vertical”mergers of complements — more than just exercises in Tirole

[NBER @nberpubs]

Like other industries, "complements" are merging in healthcare. Most physicians are now hospital employees. Associated prices increase with measures of foreclosure and recapture, from @zackcooperYale, @stuartcraig, Aristotelis Epanomeritakis, @matthewgrennan, Joseph R. Martinez, @ProfFionasm, and @ashleyterese https://t.co/XpuVDtIeu1

[Ben Golub @ben_golub]

Great list but I disagree with 1. The number of reasonable completions is huge and the referees at a given journal will want a random, unpredictable subset.

It's better to make the main idea clear and indicate what extensions can be done -- without doing all of them.

[Rock & Roll Hall of Fame @rockhall]

Innovators who redefined the possibilities of hip-hop and pop, @Outkast joins the Hall of Fame. Watch Outkast’s induction into the Rock & Roll Hall of Fame on November 8, 2025, on @DisneyPlus

[Laura Veldkamp @laura_veldkamp]

We have a few spots left. If you are interested in learning more about how to conduct research about the data economy, sign up today: https://t.co/ZjEJ3hPbuQ #econtwitter @isaacbaley #Finance #AI

[Neale Mahoney @nealemahoney]

Call for papers for @StanfordEcon SITE conference on Market Failures and Public Policy, co-organized by me.

The submission deadline is April 1, 2025.

Link with info on how to apply below:

[Laura Veldkamp @laura_veldkamp]

Finally! Today is the official release date for The Data Economy. Order today at https://t.co/qUSo8i3Hnm or at https://t.co/xAoR2U7Pw2. If you would like to use this for a class, email me or Isaac for slides + solution manual. #EconTwitter #Data

[Matt Grennan @matthewgrennan]

@btshapir Friendly amendment: editor never minds a decline if you do it quickly and with good recos of alternatives.

Also: big takeaway from 3 years of editing is how outstanding 90% of folks are in sharing time and expertise. Many many thanks!

[Luca Maini @luca_maini]

I have terrible news. I took a sneak peek at current submission numbers for ASHEcon and the Prescription Drugs area is not number one. We're not even on the podium. Are we gonna let Health Systems and Health Care Financing win?

[Matt Grennan @matthewgrennan]

@ktkadakia @JAMANetworkOpen @ChristinaLalani @rwyeh Thanks for the shout out and this interesting paper—I learned a lot!