Professor of Economics at Stockholm University. Co-editor @AEJ:EP. Interests: Public Finance and Labor Economics.
Stockholm, Sverige
Joined October 2011
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David Seim 🇪🇪🇸🇪🇺🇦 retweeted
This is not how we should proceed. I hope the authors and MR retract this based on a wide range of folks making a good case against this type of review / assessment.
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
Hello @elonmusk and @tylercowen ,
You have just decided to publicly attack our research, six days before the vote on the California billionaire wealth tax.
Your attempt to discredit our work and that of our numerous academic colleagues is pathetic.
Let’s take a look. 🧵
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
This Hoover Institution study, which has fueled the deluge of ads (more than $200 million spent by billionaires so far) to defeat the California billionaire tax, is spectacularly misleading.
Let me explain its crucial flaw. 🧵
California's Billionaire Tax Act would collect roughly $30 billion. Accounting for lost income taxes from departures, the mean Net Present Value is negative $39 billion, from Benjamin Jaros and Joshua Rauh nber.org/papers/w35899
Readers added context they thought people might want to know
Zucman argues that the tax will raise his projected revenue because billionaires who leave CA after 1/1/26 will be taxed anyway.
At least $542B of net worth (Page, Brin, Thiel) departed the state by 12/31/25.
The entire thread is a misleading denial of this fact.
ft.com/content/d66976…
nytimes.com/2026/04/27/us/…
forbes.com/sites/forbeswe…
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
Hello @ericschmidt , former Google CEO: your billionaire friends are not going to be happy with you.
Digging into filings with the California Fair Political Practices Commission (FPPC) from September 24 reveals an embarrassing fact — one that undermines a key part of your friends’ strategy for preserving their tax privileges🧵
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
Hello dear Spotify founder @MartinLorentzon
There is nothing “absurd” about pointing out that Swedish billionaires like yourself pay a lower share of their income in taxes than ordinary Swedes. It is a fact.
But since you question our research on the regressivity of Sweden’s tax system, allow me to explain the main conclusions of our work, the most comprehensive to date on this issue. 🧵
Zucmans och Miljöpartiets grundsyn är absurd. De gör ett problem av att vi har framgångsrika företagare. Deras syn är oerhört skadligt för Sverige. svd.se/a/d4PJgz/svenskt-nari…
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
Call for Papers: Nordic Public Policy Symposium, Helsinki on 10-11 Dec!
#publicecon topics, e.g. taxation, social insurance, inequality, health, education, regulation, labor markets, firms & innovation, environmental & climate policy.
DL: Oct 11!
verotutkimus.fi/en/npps-2026…
New work with @mariusring and @gabriel_zucman: Holding companies have become an increasingly important tool for tax avoidance among the richest households in Norway and Sweden.
New research: with @mariusring and @SeimSeim, we studied the taxes paid by the super-rich in Sweden and Norway, thinking that if some countries must do a good job of taxing billionaires, it must be them.
To our surprise, we found… the opposite. 🧵
gabriel-zucman.eu/files/RSZ2…
Fantastic work by my excellent colleague David Strömberg and coauthors. When AI use rose among Chinese students, homework scores increased while exam scores plunged. @SU_Economics
Homework scores once predicted exam performance; now a new study shows those who score highest are, perversely, more likely to do worse in exams. Our charts explain the trend economist.com/graphic-detail…
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
Very excited to see our paper forthcoming in the QJE!
Our publicly available database on hours worked, disaggregated by age, gender, and other socioeconomic characteristics, can be found here:
dropbox.com/scl/fo/ezcdqlpgf…
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
When private insurance buys faster access to public care
Mårten Palme @SU_Economics, David Seim @SeimSeim @SU_Economics, Johannes Spinnewijn @LSEEcon, Jens Wikström @econGU
ow.ly/GJat50ZakAl
Ny studie om privata sjukvårdsförsäkringar 🇸🇪
Huvudresultat:
1️⃣ De går främst till höginkomsttagare (ofta via arbetsgivare)
2️⃣ Arbetsgivarförsäkring leder kausalt till mer vård och snabbare specialistkontakt
3️⃣ De ökar belastningen på offentligt finansierad vård
Ny studie av kollegorna! svt.se/nyheter/inrikes/ny-st…
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
Har bostadsförmögenheterna gjort oss rikare eller bara omfördelat tillgångar? Bostadsvärdena syns i statistiken, men den skuld som framtida ägare måste dra på sig gör det inte. Som samhälle är därför vi både fattigare och ojämlikare än vi tror. efn.se/den-markliga-paradoxe…
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
New data on Swedish household wealth: total assets have tripled in 20 years. The number of euro billionaires has increased fivefold — but ordinary wage earners have also built wealth through home ownership and funds.👇t.ly/9KR7S @ollehammar Paula Roth Felicia Stokke
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
🚨 a bit late to the game, but I am hiring a pre-doc fellow at @Yale @YaleSOM ! The fellow will be working on projects in the economics of education. Details here: barbarabiasi.com/uploads/1/0… please circulate! @econ_ra
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
I’m excited to share that I’ll be joining @SU_Economics as an Assistant Professor, following a postdoc with @Brown_Economics and @Watson_School
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
NEW JOB AD - POSTDOCTORAL RESEARCHER in PUBLIC ECONOMICS - (“Drivers and consequences of rising economic inequality”)
2 positions (Deadline May 17 2026)
sites.google.com/site/salvat…
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
Forthcoming in the AER: "Understanding High-Wage Firms: Monopoly, Monopsony, and Bargaining Power" by Horng Chern Wong. aeaweb.org/articles?id=10.12…
#EconTwitter @econ_ra: We’re looking for 2 full-time pre-docs to join our team working on inequality with administrative data. Great projects, great environment—come work with us at @SU_Economics!
Interested candidates can apply here by May 5, 2026: lnkd.in/dbn8ngSx
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
🚨🚨 NEW WORKING PAPER 🚨🚨
"Barriers to Benefits: Unemployment Insurance Take-Up and Labor Market Effects (with @BrendanDMoore)
➡️We ran a large-scale field experiment among 50k likely eligible workers to study the role of information frictions in the incomplete take-up of UI
David Seim 🇪🇪🇸🇪🇺🇦 retweeted
🚨 Job Alert 🚨
I'm hiring a full-time RA (6-months) @IIES_Sthlm. Work with me and fantastic coauthors on labor + human capital projects using large administrative and experimental data.
📅 Start: May 1 (flexible)
⌛️Apply by: March 20
Apply here: su.varbi.com/en/what:job/job…
