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Martin Kolk

@martinkolk.bsky.social
881 followers 262 following 117 posts

Demographer at Stockholm University and the Institute for Future Studies. www.su.se/profiles/mkolk

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Martin Kolk @martinkolk.bsky.social · 31/08/2026
Det här är konsekvensen av vår nuvarande regerings 4-åriga politik med subventioner av bensinbilar sedan valet i slutet av 2022. Andra vägval hade varit möjliga. Data från: theicct.org/publication/...
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Martin Kolk @martinkolk.bsky.social · 18/08/2026
Childhood in Sweden is really becoming dramatically stratified. Household-equivalized disposable income among children (0-18) in Sweden. The poverty threshold is 60% of the median income in 2022. A novel visualization by Aradhya, @rafgrotti.bsky.social, @rnieuwenhuis.bsky.social t.co/WwWBKcO5O4
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Liliana P. Calderón-Bernal @lpcalderonb.bsky.social · 30/07/2026
My second PhD paper is out! 🎉 'Assessing the Agreement Between Microsimulated and Register-Based Kin Counts in Sweden',with @demography.bsky.social , @martinkolk.bsky.social & @ezagheni.bsky.social @mpidr.bsky.social @suda-sthlm.bsky.social 🔗 tandfonline.com/doi/full/10.1080/00324728.2026.2706778
tandfonline.com
Assessing the agreement between microsimulated and register-based kin counts in Sweden
Estimating kinship networks is a data-intensive undertaking, usually conducted using empirical sources or demographic models. Although empirical data, such as population registers, provide observed...
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Martin Kolk @martinkolk.bsky.social · 21/07/2026
What does the current fertility decline in Sweden look like from a cohort perspective? See my new preprint that shows that fertility decline is modest for 1985 to 1992 cohorts, though is more dramatic at younger ages in later cohorts. doi.org/10.17045/sth...
doi.org
Examining the 2010-2024 Fertility Decline in Sweden From a Cohort Perspective
This article examines the fertility downturn in Sweden from 2010 to 2024 from a cohort perspective, in contrast to the period-based analyses that have dominated most research on the current decline. Using fertility data from the Human Fertility Database, I analyze the childbearing of Swedish women born in the 1960s, 1970s, 1980s, 1990s, and early 2000s across their observed life courses. The analysis compares cohort fertility schedules by age, period, and cohort, contrasts the 2010-2024 decline with the downturn of 1995-2002, and uses a basic freeze-rate approach to update earlier cohort forecasts for younger cohorts. The results show that the recent sharp fall in period fertility was only moderately reflected in cohort fertility up through the 1980s cohorts, whose fertility remained relatively close to that of women born in the 1970s. By contrast, women born in the 1990s, and especially the late-1990s cohorts, have accumulated markedly fewer first births by young adult ages. Much of the current decline is driven mainly by missing and postponed first births among the 1990s cohorts. The eventual completed fertility of women now in their twenties will therefore depend heavily on the extent of later recuperation. One cannot yet say if the 2010s fertility decline will lead to a marked reduction in cohort fertility in Sweden.
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GENUS @genus.bsky.social · 22/05/2026
Does the wealthy have more children❓ New Swedish register evidence shows only modest fertility gaps by wealth, but higher wealth among the childless, in particular among childless women - by @martinkolk.bsky.social 🔗 link.springer.com/article/10.1...
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Martin Kolk @martinkolk.bsky.social · 18/05/2026
How is wealth related to fertility? In contrast to an emerging positive association between income and fertility in the Nordics, wealth has its own (mostly) negative association with fertility. In particular, childless women have more wealth than their parous peers. doi.org/10.1186/s411...
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Martin Kolk @martinkolk.bsky.social · 04/05/2026
Om nya och gamla befolkningskriser. www.dn.se/kultur/marti...
dn.se
Martin Kolk: Sluta låtsas att vi har en befolkningskris!
Sveriges befolkning väntas öka enligt nya prognoser från SCB.
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The Swedish Institute for Social Research (SOFI) @sofi.su.se · 01/04/2026
Nu kan du göra egna analyser av Levnadsnivåundersökningen (LNU). Skapa diagram, följ förändringar över tid och ladda ner data direkt. Ett värdefullt verktyg och ett enkelt sätt att arbeta med en av Sveriges viktigaste datakällor om levnadsförhållanden. levnadsnivaundersokningen.se
levnadsnivaundersokningen.se
LNU-visualiseringar
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Maximilian Reichert @mischewu.bsky.social · 17/04/2026
@unil.bsky.social will host the LIVES International Research Days in Lausanne on 4-5 November 2026. Please do submit your work to our panel on family complexities, social policies, and social stratification, with @martinkolk.bsky.social and @rossellaciccia.bsky.social as experts. It'll be lovely!
centre-lives.ch
LIVES International Research Days 2026 | Centre LIVES
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Per Engzell @pengzell.bsky.social · 23/04/2026
Yours truly presented work with @martinhallsten.bsky.social and @martinkolk.bsky.social on elites and their historical persistence in Sweden
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Rense Nieuwenhuis @rnieuwenhuis.bsky.social · 29/04/2026
Thank you, Agnieszka Chłoń-Domińczak and SGH Warsaw School of Economics for hosting the 4th NDC Conference Presented joint work with Linda Kridahl and @martinkolk.bsky.social on “Family life trajectories and old-age poverty in Sweden: The role of NDC pensions and other pension schemes”
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Martin Kolk @martinkolk.bsky.social · 28/03/2026
Bra illustration av riskerna med moderna survey-insamlingsmetoder när man studerar trender i mindre undergrupper. Bra att hålla ögonen på de större mönstren, när man till exempel studerar den numera ofta påstådda nyandligheten. www.bbc.com/news/article... yougov.com/en-gb/articl...
bbc.com
Church attendance report pulled after YouGov finds 'fraudulent' responses
The original report claimed a rise in young people attending church in England and Wales.
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Martin Kolk @martinkolk.bsky.social · 26/11/2025
Mer om religion. Första artikeln väckte ordentligt intresse, med fem repliker. Här svarar jag. www.dn.se/kultur/marti...
dn.se
Martin Kolk: Joel Halldorfs trendspaning håller säkert i församlingarna på Södermalm
En mindre medlemsökning i Svenska kyrkan förklaras i huvudsak av tonåringar som går runt konfirmationen – den är inget stöd för en religiös ungdomstrend.
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Martin Kolk @martinkolk.bsky.social · 19/11/2025
Läs mitt inlägg om sekulariseringstrender på DN kulturdebatt idag. www.dn.se/kultur/marti...
dn.se
Martin Kolk: Ni talar om en kyrktrend bland unga – men den stämmer inte
Forskaren Martin Kolk granskar påståendet om en religiös återkomst bland unga i Sverige.
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Martin Kolk @martinkolk.bsky.social · 30/09/2025
Här kan man se en diskussion om barnafödande i SVTs kulturnyheter, där det vrids och vänds på sjunkande barnafödande i olika perspektiv. www.svtplay.se/video/KZmQoQ...
svtplay.se
Kulturnyheterna special: En framtid utan barn
Sverige har idag de lägsta födelsetalen sedan 1751 och regeringen har tillsatt en utredning för att svara på varför. Men även runt om i världen sjunker födelsetalen. Handlar det om politik, teknik, in...
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Martin Kolk @martinkolk.bsky.social · 19/08/2025
In our new study in Population and Environment, we examine how environmental concerns shape public attitudes toward childbearing in Sweden. We find views linking environmental concerns with reproduction are widespread, even if we find less support that they affect behavior. doi.org/10.1007/s111...
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Martin Kolk @martinkolk.bsky.social · 11/08/2025
Sweden reached near gender parity in employment in the late 1980s, and if anything, the gender gap has increased since then. There used to be near-universal employment among Swedish men, with Swedish women nearly catching up in the 1980s. Swedish labor force survey, age 35-44.
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Martin Kolk @martinkolk.bsky.social · 10/08/2025
I dag publicerades min artikel på DN Debatt där jag argumenterar för en höjning, och beskattning av barnbidraget, baserat på att vi ser ökade socioekonomiska skillnader i föräldraskap. www.dn.se/debatt/hoj-b...
dn.se
DN Debatt. ”Höj barnbidraget – unga familjer måste prioriteras”
DN Debatt. I takt med att barnafödandet minskar bör barnbidraget höjas och göras skattepliktigt, skriver Martin Kolk, docent i demografi.
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Martin Kolk @martinkolk.bsky.social · 20/07/2025
Se en ny artikel i Svenska Dagbladet där jag intervjuades om huruvida de senaste 10-årens sjunkande barnafödande är ett socioekonomiskt problem eller inte. www.svd.se/a/4BpQ96/for...
svd.se
Forskaren: Inget problem med färre barn
Det låga barnafödandet i Sverige gäckar regeringen, som nu har tillsatt en utredning. Men utredningens problemformulering ifrågasätts av demografiforskaren Martin Kolk. ”Personligen tycker jag inte at...
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Martin Kolk @martinkolk.bsky.social · 16/07/2025
In a new preprint by Linus Andersson, myself and Jan Saarela, we tracks every marriage in Finland 1972 2020 to show how religious conversions shape endogamy — and how those patterns differ for men and women. doi.org/10.17045/sth...
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Liliana P. Calderón-Bernal @lpcalderonb.bsky.social · 08/07/2025
I'm happy to share that the 2nd paper of my PhD "Assessing the validity of microsimulated kinship networks using Swedish population registers", with @demography.bsky.social, @martinkolk.bsky.social and @ezagheni.bsky.social, is available as an MPIDR Working Paper share.google/g0nVmiSI6huB...
share.google
MPIDR - Publications
The Max Planck Institute for Demographic Research (MPIDR) in Rostock is one of the leading demographic research centers in the world. At the MPIDR, researchers from all over the world investigate demo...
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GENUS @genus.bsky.social · 08/07/2025
Parenthood among same-sex couples has changed as policy & social contexts have evolved. Swedish data revealed that same-sex parenting increased over time among women, but remained rare among men. 👉 New paper by Mollborn, @martinkolk.bsky.social & Evertsson 🔗 genus.springeropen.com/articles/10....
genus.springeropen.com
Recent trends in parenthood in Swedish same- and different-sex legal unions: emerging gender and socioeconomic differences - Genus
Parentalization, or becoming a parent and being legally and socially recognized as such, has long been constrained for sexual minorities. Although many studies have examined the outcomes of children o...
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Vienna Yearbook of Population Research (VYPR) @vypr.bsky.social · 28/05/2025
🚨Check out the latest @vypr.bsky.social Data&Trends. Jonas Wood and colleagues investigate urban-rural differences in northern and western Europe regarding women’s educational gradients in fertility. 🔗 austriaca.at?arp=0x004055... #demography @demographyvienna.bsky.social
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Martin Kolk @martinkolk.bsky.social · 19/05/2025
I think these types of criticisms of quantitative models in the social sciences are largely on point. My solution would be to rely more on simple descriptive and large high powered studies to build robust findings, before moving towards more complicated (and much more fragile) designs.
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Max Planck Institute for Demographic Research (MPIDR) @mpidr.bsky.social · 30/04/2025
With a little delay we learned that @lpcalderonb.bsky.social, who could not attend #PAA2025, won a Best Poster Award! Her colleagues put up the poster and a note from Liliana and co-author @martinkolk.bsky.social jumped in to present the research. Congrats Liliana! @popassocamerica.bsky.social
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Martin Kolk @martinkolk.bsky.social · 28/03/2025
Here is some great new scientific communication on our new overview perspective paper on the interplay between socioeconomic status and genetics. Research has seldom looked better!
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Martin Kolk @martinkolk.bsky.social · 26/03/2025
If anyone wants to learn more about households and kinship in Sweden, they can join this seminar at 13:00 CET where I present a new study on how an indivudal's household members change over the life course. www.su.se/department-o...
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Abdel Abdellaoui @dr-appie.bsky.social · 26/03/2025
In every civilization, people end up sorted into levels of socio-economic status (SES). We explore the history, present, and future of scientific research on the complicated relationship between SES and DNA in @naturehumbehav.bsky.social💰🧬🎓 Link: rdcu.be/efacK Thread below 👇🏽
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Martin Kolk @martinkolk.bsky.social · 20/03/2025
New study by Klein, Saarela, and Kolk. The religious live longer! Full table approach to mortality by religion.
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Martin Kolk @martinkolk.bsky.social · 17/03/2025
In a new study recently published in Demography, Kolk, @jlucastilley.bsky.social, @ylvamoberg.bsky.social , von Essen, and Burn provide a detailed sociodemographic overview of the Swedish transgender population. doi.org/10.1215/0070... (@readdemography.bsky.social)
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Martin Kolk @martinkolk.bsky.social · 25/02/2025
Compared to all previous societies in human history, financial transfers in old age have reversed in contemporary European welfare states such as Sweden. Virtually none among the oldest (here aged 77+) receive transfers from their children, while it is very common to give downward transfers.
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Martin Kolk @martinkolk.bsky.social · 11/02/2025
People focusing on current global fertility declines rely nearly only on period data. Cohort and period trends can however look very different. The declines in fertility in central & eastern Europe in the 1990s only resulted in quite modest eventual cohort TFR decline.
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Martin Kolk @martinkolk.bsky.social · 24/01/2025
I svensk politisk debatt hör man ofta att miljöfrågor har blivit polariserade höger-vänster frågor. Det kan säkert stämma på partinivå där partierna idag har divergerat, men bland invånarna i Sverige finns bara en mindre ökning för sambandet mellan ideologi och miljöintresse de senaste åren.
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The Institute for Analytical Sociology @iasliu.bsky.social · 21/01/2025
New research from Jesper Lindmarker PhD student at IAS together with @sd.se & @martinkolk.bsky.social. The study examines how marriage and cohabitation shape longevity across the life course, using Swedish register data. link.springer.com/article/10.1...
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Martin Kolk @martinkolk.bsky.social · 09/01/2025
Yet another study (this time by Claudia Goldin) that uses cross-sectional data, and finds evidence for a U-shaped pattern for gender equality and fertility, even though this pattern does not exist for (almost) any country across time. www.nber.org/papers/w33311
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Martin Kolk @martinkolk.bsky.social · 07/10/2024
In our new preprint, we examine how environmental concerns shape public attitudes toward childbearing in Sweden. We find views linking environmental concerns with reproduction are widespread, even if we find less support that they affect behavior. doi.org/10.17045/sth...
su.figshare.com
Attitudes towards childbearing, population, and the environment: Examining prevalence and demographic and psychological correlates
Environmental concerns may influence personal fertility decisions and general opinions about childbearing and population, but research on this topic is still relatively scarce. In two studies based on...
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Kieron Barclay @kieronbarclay.bsky.social · 11/03/2024
New paper out, using Norwegian register data. Overall, our results are consistent with small to negligible effects of birth spacing behavior on (non-pregnancy-related) health outcomes for parents. I was lucky to have two excellent collaborators: @martinkolk.bsky.social & Øystein Kravdal
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Demography - the flagship journal of PAA @readdemography.bsky.social · 08/03/2024
Posted: “Birth Spacing & Parents’ Physical & Mental Health.” @kieronbarclay.bsky.social @martinkolk.bsky.social & O Kravdal find that “very short & longer ave. birth intervals ↑ the probability of care-seeking for physical health problems.” @mpidr.bsky.social read.dukeupress.edu/demography/a...
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Max Planck Institute for Demographic Research (MPIDR) @mpidr.bsky.social · 25/10/2023
No previous research has examined how large inequalities are when looking at total lifetime pensions. That is why Jiaxin Shi @mpidr.bsky.social and Martin Kolk (Stockholm University) examined the inequalities in lifetime pensions in Sweden. www.demogr.mpg.de/go/pension
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Vienna Yearbook of Population Research (VYPR) @vypr.bsky.social · 01/02/2024
🎉Just out online on the #2024VYPR!!! Emma Engström and @martinkolk.bsky.social explore the interrelations between population, affluence and technology for various environmental impacts using IPAT-type modelling @vypr.bsky.social #demography doi.org/10.1553/p-n5...
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Martin Kolk @martinkolk.bsky.social · 04/12/2023
The number of deaths in the war in Gaza is now over 0.7% of the population and may be higher. As a comparison, the US lost 0.32% of their population in the Second World War. Denmark lost 0.16%, Norway 0.32%, Canada 0.38%, the UK 0.84%, Italy 1.16%, and France 1.44% of their 1939 population.
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Martin Kolk @martinkolk.bsky.social · 16/11/2023
Adult children living with their parents, now outnumber parents with young children, at all ages up to age 25 for women and age 27 for men in Sweden. This shows how much, family formation and leaving the parental household have been postponed in Sweden.
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Martin Kolk @martinkolk.bsky.social · 20/10/2023
Fertility in early adulthood differs dramatically across social contexts, for reasons that fit poorly with most demographic and developmental theories. It has reached a rate of nearly 1/3 in a year, to many contexts where it has been very low.
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Martin Kolk @martinkolk.bsky.social · 06/10/2023
My first post here will be to respost our new paper in were we count all observable kinship relations in contemporary Sweden. We use linked parent-child records to estimate counts of kin such as cousins, grandparents, nieces/nephews, and grandparents. doi.org/10.1215/0070... (open access)
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