Hannes Ullrich
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Hannes Ullrich
@hannesullrich.com
5.7K followers 1.4K following 310 posts
Economist at DIW Berlin, University of Copenhagen, and Berlin School of Economics

Research on Digitilization, Health Care, and Industrial Organization

https://www.hannesullrich.com
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Hannes Ullrich @hannesullrich.com · Nov 22
Now published in the December issue of Quantitative Marketing and Economics: link.springer.com/article/10.1...

#QME has a very efficient, no BS editorial policy. Can highly recommend!
Reposted by Hannes Ullrich
meganstevenson.bsky.social
Robynn Cox and I have a new paper! It's about the history of predictive algorithms in criminal justice, back in the 1920s-1950s. This paper is the result of five years of research and we're so happy to see it out. 🧵 1/
February 13, 2026 at 2:39 PM
Reposted by Hannes Ullrich
joniaskola.bsky.social
2/12 There is a reason why Putin, Musk, Trump, Vance, Thiel, and Xi all spend fortunes to attack Brussels.

They do not hate the EU because it fails.

They hate it because of its potential.

Our unity is their nightmare
February 10, 2026 at 8:31 AM
Reposted by Hannes Ullrich
ratswd.bsky.social
📢 „Das wäre ein Durchbruch“

🗣 Interview zum geplanten Forschungsdatengesetz mit unserer Vorsitzenden Prof. Dr. Kerstin Schneider
February 6, 2026 at 1:45 PM
Reposted by Hannes Ullrich
josephpolitano.bsky.social
core part of the ostensible economic justification for mass deportation was that Americans would rush in to take all the jobs immigrants left, but now unemployment rates for native born Americans are rising and the admin is sending people out to do damage control
A graph of the unemployment rate by immigration status showing a rise in native born unemployment
February 10, 2026 at 2:28 PM
hannesullrich.com
Sehr wichtige Stellungnahme des @vfsecon.bsky.social zum #FDG Entwurf des #BMFTR: www.socialpolitik.de/de/referente...
Verdeutlicht, wieviel auch nach evtl. Beschluss noch zu tun bleibt und weitere Gesetzesänderungen in der nahen Zukunft wichtig sein werden.
vfsecon.bsky.social Verein für Socialpolitik e.V. @vfsecon.bsky.social · 6d
▶️ Wie wirksam ist Strafverfolgung?
▶️ Welche arbeitsmarktpolitischen Maßnahmen schützen tatsächlich vor Schwarzarbeit?
▶️ Und ist bessere Bildung ein Schlüssel zur Prävention von Gewalt in der Familie?
February 10, 2026 at 2:41 PM
Reposted by Hannes Ullrich
vfsecon.bsky.social
Die Beantwortung dieser und vieler weiterer zentraler Fragen hängt entscheidend von der Verfügbarkeit und der Verknüpfung hochwertiger Forschungsdaten ab – in der Sozialversicherung und im Gesundheitswesen ist dies mitunter sogar lebenswichtig.
February 10, 2026 at 12:15 PM
Reposted by Hannes Ullrich
vfsecon.bsky.social
▶️ Wie wirksam ist Strafverfolgung?
▶️ Welche arbeitsmarktpolitischen Maßnahmen schützen tatsächlich vor Schwarzarbeit?
▶️ Und ist bessere Bildung ein Schlüssel zur Prävention von Gewalt in der Familie?
February 10, 2026 at 12:15 PM
Reposted by Hannes Ullrich
gwagner.com
Little to add to Trump's Endangerment Finding move that hasn't already been said, but here's the key bit: Framing matters.

This isn't "economics" vs climate, or some kind of noble "cost-cutting" crusade.

It's a handout to narrow fossil interests, counter to economic forces.
February 10, 2026 at 12:27 PM
Reposted by Hannes Ullrich
histoftech.bsky.social
No joke: I got angry hate mail today for writing an obituary of a Black woman scientist—because the person felt she did didn’t deserve the recognition.

Which just makes me want to share it again: www.nature.com/articles/d41...
Gladys Mae West obituary: mathematician who pioneered GPS technology
She made key contributions to US cold-war science despite facing huge barriers as a Black woman.
www.nature.com
February 6, 2026 at 9:09 AM
Reposted by Hannes Ullrich
kajakallas.bsky.social
Russia continues to answer diplomacy with missiles.
We are determined to make that choice painfully expensive.

Today, we present our 20th sanctions package.

Sanctions severely hurt Russia’s economy.
And every sanction chips away at its capacity for war. (1/9)
February 6, 2026 at 2:40 PM
Reposted by Hannes Ullrich
scottgottliebmd.bsky.social
My Op Ed in Today's Washington Post: "The long-lasting effects of viruses — and the anti-vaccine movement. For some people, a viral infection can have devastating long-term effects."

wapo.st/4qjFtWk
February 6, 2026 at 3:37 PM
Reposted by Hannes Ullrich
aschwartz.bsky.social
One of the most important scientific achievements of the last 50 years was making the causal links between prior viral infections (e.g. EBV) and subsequent serious diseases.
scottgottliebmd.bsky.social Scott Gottlieb, MD @scottgottliebmd.bsky.social · 10d
My Op Ed in Today's Washington Post: "The long-lasting effects of viruses — and the anti-vaccine movement. For some people, a viral infection can have devastating long-term effects."

wapo.st/4qjFtWk
February 6, 2026 at 3:52 PM
Reposted by Hannes Ullrich
digitalecon.org
🚨 Coming up at #VIDEseminar: David Reiley (University of California, Berkeley)

“Long or Short? Personalizing Ad Length and Frequency”

🔜 Wed, February 4, 11am New York, 5pm Berlin. Open to anyone!

Further information: www.digitalecon.org/seminar
Paper title: Long or Short? Personalizing Ad Length and Frequency Authors: Ali Goli (University of Rochester), David Reiley (UC Berkeley), Wenfeng Qiu (Sirius XM Holdings Inc.), Jonas Tungodden (Norwegian School of Economics) Abstract We study the economics of advertising length using a large-scale randomized experiment on 18.3 million Pandora listeners. The experiment promoted a listening feature and randomly assigned users to advertising campaigns that varied in ad format (10 vs. 30 seconds) and frequency. For both users unfamiliar with the feature and those already familiar, we document that both ad formats generate incremental effects, with the relative advantage of long over short ads substantially larger among unfamiliar users. We then build a machine learning model to capture heterogeneity in both responsiveness to the campaign and realized exposure levels, and conduct off-policy evaluation of alternative campaign designs. We find that a personalized policy that optimally assigns users across the available experimental conditions, choosing the ad format and frequency for each user, increases incremental ad effects by about 30 percent. Two-thirds of this efficiency gain comes from leveraging heterogeneity in exposure rather than heterogeneity in responsiveness to the campaign.
February 2, 2026 at 2:50 PM
Reposted by Hannes Ullrich
digitalecon.org
The Spring 2026 VIDE seminar schedule is up!

Further information and mailing list sign-up at: www.digitalecon.org
Schedule - Spring 2026 Wednesday, February 4 - David Reiley (UC Berkeley) Long or Short? Personalizing Ad Length and Frequency (with Ali Goli, Jonas Tungodden and Wenfeng Qiu) Wednesday, March 4 - Ginger Zhe Jin (U of Maryland) TBD Wednesday, April 8 - Joshua Gans (U of Toronto Rotman) TBD Wednesday, May 6 - Dokyun Lee (Boston U) Take caution in using LLMs as human surrogates: Scylla Ex Machina
January 31, 2026 at 6:40 PM
Reposted by Hannes Ullrich
julianreif.bsky.social
Thoughts from a newbie using Claude Code for the first time.

I don’t always use GitHub for my projects, but with Claude Code it feels like a must. Having a tool read and write files without version control is just too scary.
January 28, 2026 at 3:04 PM
Reposted by Hannes Ullrich
monika-schnitzer.com
Empfehlungen der #Sozialstaatskommission :
Endlich ein Reformentwurf, der ehrgeizig die Probleme angehen will. Bleibt zu hoffen, dass die Umsetzung gelingt!
January 28, 2026 at 11:22 AM
Reposted by Hannes Ullrich
auschwitzmemorial.bsky.social
Auschwitz was at the end of a process. We must remember that it did not start from gas chambers.

This hatred gradually developed: from ideas, words, stereotypes & prejudice through legal exclusion, dehumanization & escalating violence... to systematic and industrial murder.

Auschwitz took time.
A bird's-eye view of a former Auschwitz II-Birkenau camp showing a wide dirt pathway flanked by parallel rows of barbed-wire fences. Groups of visitors walk along the path, surrounded by the remnants of brick structures and barracks, now reduced to foundations. Green grass contrasts with the somber history of the site, as the path leads toward a guard tower in the distance.
January 27, 2026 at 11:00 AM
Reposted by Hannes Ullrich
p-hunermund.com
Germany increased its research and innovation spending by 4.9% in 2024, exceeding inflation (3.1%). The strongest growth came from services, highlighting the ongoing structural transformation of the German economy.
January 27, 2026 at 12:46 PM
Reposted by Hannes Ullrich
ckronenberg.bsky.social
#econsky et al. I am happy to announce the #call_for_papers for the 2026 Economics of Mental Health Workshop!
The workshop is hosted by @peibich.bsky.social at Paris Dauphine and takes place from June 22-23. They keynotes are @jcmecon.bsky.social & Marco Bertoni. 1/n
January 26, 2026 at 10:28 AM
Reposted by Hannes Ullrich
johnnyryan.bsky.social
A spark of action from the European Commission on social media recommender algorithms at long last ec.europa.eu/commission/p...
Commission investigates Grok and X\'s recommender systems under the Digital Services Act
The European Commission has launched a new formal investigation against X under the Digital Services Act (DSA).
ec.europa.eu
January 26, 2026 at 11:16 AM
Reposted by Hannes Ullrich
henrymance.ft.com
Despite the focus on small boats, most refugees stay in poor countries.

I went to Sudan, where nearly 1/3 of the population has left their homes, to see how the UN is coping with Trump's cuts and the west's retreat.

Sudan is a brutal, forgotten war. Please do read: as.ft.com/r/7db76b9a-8...
Adapt, shrink or die: the global crisis in humanitarian aid
[FREE TO READ] The UN’s outgoing High Commissioner for Refugees on the west’s retreat in Sudan, the folly of abandoning state-building and ‘necessary anger’
as.ft.com
January 26, 2026 at 9:11 AM
Reposted by Hannes Ullrich
georgweizsaecker.bsky.social
Many discussions about 🇪🇺 tech sovereignty. 👇🏻

A fascinating aspect, sometimes overlooked, is the public's behavioral reaction to MAGA: e.g., how many people and institutions will drop PayPal and use Wero?

(A coordination problem where every user attracts others.)

werotracker.eu
January 25, 2026 at 11:45 AM
Reposted by Hannes Ullrich
diw.de
We are looking forward to the second edition of the @diw.de - @oecd-ocde.bsky.social Industrial Strategy Dialogue on upcoming Monday, January 26 at 11:30 AM – join us in person at DIW Berlin or follow the event via livestream!
📝Registration & livestream: www.diw.de/en/diw_01.c....
DIW-OECD Industrial Strategy Dialogue Industrial Policies and Market Dynamism – what role for competition policy in industrial strategies? January 26, 2026 11:30 AM at DIW Berlin Register now!
January 22, 2026 at 9:38 AM
Reposted by Hannes Ullrich
diw.de
Join us in person or virtually for the second @diw.de - @oecd-ocde.bsky.social Industrial Strategy Dialogue on Monday, Jan 26 (11:30-13:00) in Berlin:
"Industrial Policies and Market Dynamism – what role for competition policy in industrial strategies?"
🔗 www.diw.de/de/diw_01.c....
January 16, 2026 at 1:45 PM
Reposted by Hannes Ullrich
bsoeberlin.bsky.social
📣 Call for Papers

Join us for the 2nd Berlin PhD Conference in Economics on July 6-8, 2026.

🗓 July 6-8, 2026
⏰ Application deadline: 25 January 2026

🔗 Learn more & apply: berlinschoolofeconomics.de/event-detail...

@wzb.bsky.social @hertieschool.bsky.social #phdconference
December 11, 2025 at 3:10 PM