Martin Kolk (@MartinKolk) / X

Martin Kolk

2,429 posts

Martin Kolk

@MartinKolk

Demographer at Stockholm University @SUDA_Sthlm, and the Institute for Futures Studies @Framtidsstudier

Stockholm

Joined May 2017

Pinned
Martin Kolk
@MartinKolk
Nov 24, 2022
In a new study in Population Studies, I show that income is associated with higher childbearing in Sweden. The differences are large and are found for both men and women. I accumulate annual income histories from age 20-60 to estimate life course income.
tandfonline.com
The relationship between life-course accumulated income and childbearing of Swedish men and women...
This study uses income accumulated over ages 20–60 to examine whether richer or poorer individuals have more children. Income histories are calculated using yearly administrative register data from...
Martin Kolk
@MartinKolk
May 9, 2023
Fertility in the Nordics keeps falling. What was earlier a rather gradual decline has accelerated in 2022. Inconsistent with explanations when societal gender regimes are the primary explanatory factor for cross-national differences in fertility.
Marika Jalovaara
@MarikaJalovaara
May 9, 2023
Total #Fertility Rates (TFRs) from all Nordic Countries are in now. A drop in Iceland too, after a slight increase in 2021. In Finland, TFR has declined 29% since 2010, which is the biggest decline in all EU and Efta countries.
demographic-research.org
Demographic Research - Weak support for a U-shaped pattern between societal gender equality and...
Volume 40 - Article 2 | Pages 27–48
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Martin Kolk
@MartinKolk
Nov 16, 2023
Adult children living with their parents, now outnumber parents with young children, at all ages up to age 26 for women and age 28 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
Nov 7, 2023
In 2021 there were 4.09 million births in the EU. In Nigeria there were 7,92 million births, in DRC 4.03 million births, and in Ethiopia 3.90 million births. In India, Pakistan, and Bangladesh there were 32.50 million births. The world is changing.
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Martin Kolk
@MartinKolk
Jun 26, 2023
In @HallstenMartin and my new paper we find 7 generations of inequality persistence (or social mobility) in education, wealth, and occupation. We use data from 18th-century northern Sweden until today in our new study in American Journal of Sociology. doi.org/10.1086/724835
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Martin Kolk
@MartinKolk
Oct 30, 2022
Replying to @katiedimartin
Saying IQ is not real is a bit like saying performance differences on the SAT are not real. You can come up with all kinds of reasonable critiques of "g", and reasonably argue whatever it measures is very plastic or environmental in origin, but it certainly measures something.
Martin Kolk
@MartinKolk
Jun 1, 2022
How likely is an individual to leave descendants to future generations (e.g. having any great-grandchildren)? In a new paper @VSkirbekk and I answer this straightforward empirical research question, that has previously only been examined indirectly. doi.org/10.1016/j.alcr…
Martin Kolk
@MartinKolk
Aug 8, 2023
Japan is often used as an example of a country facing a radically aging population, but in current forecasts, South Korea faces much more dramatic population ageing in a medium-term perspective. Japanese TFR has been quite far from the very lowest low for several decades.
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Martin Kolk
@MartinKolk
Jul 12, 2023
I was surprised that Sweden and the Netherlands had the same population size in 1900. The reason for the Netherlands growing larger is higher fertility (and a bit of colonial migration). I am curious if there is any historical work on why the countries diverged so much?
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Martin Kolk
@MartinKolk
Sep 11, 2023
In our new paper in @ReadDemography we count all observable kinship relations in contemporary Sweden using register data. We use linked parent-child records to estimate counts of kin such as cousins, grandparents, and grandparents. doi.org/10.1215/007033… (open access)
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Martin Kolk
@MartinKolk
May 16, 2023
Sweden, like many high-income countries is currently seeing a large TFR decline. TFR has declined from 1.99 in 2010 to 1.52 in 2022, with low TFR also the first quarter 2023. In this thread, I show this decline at the cohort level (comparing women born in different years).
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Martin Kolk
@MartinKolk
Jan 4, 2022
In a new working paper, a Stockholm team use Swedish register data to count all observable kin relations in contemporary Sweden. We use linked parent-child records to count kin such as cousins, grandparents, and nieces/nephews, and grandparents. 1/8 doi.org/10.17045/sthlm…
Martin Kolk
@MartinKolk
Nov 5, 2023
Something is not fully working with the life cycle model in high-income societies. A Swedish bank made a survey where half aged 60-69 supported their 32-41 year old children financially. What does this imply for society, family, and social mobility?
Undersökning: En tredjedel har stöttat andra ekonomiskt
From dn.se
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Martin Kolk
@MartinKolk
Nov 7, 2023
Replying to @MartinKolk
In 1950 there were more births in Europe than in all of Africa.
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